It was, I have some information which brings all the characteristics to what I saw, but what happened later that night was the work of something more than shadow people, leaving me mentally and physically scarred
It's not a paranormal thing, it's just your brain getting stuck in a state between sleeping and waking. Hallucinations, auditory, visual, and physical are very common. I've had it many times myself. It's pretty common if you're stressed out, or not sleeping well.
[link] just scroll down to the 'signs and symptoms' part, you don't need the whole physical explanation.
As a spiritual aspirant, I want to try and find a solution for those both gifted and cursed with such experiences. I vaguely notice the presence of beings manipulating irrationally my emotional influences, but as the article suggests, it's working by an inductive mechanism: like resonating with your negative emotions that have a specific frequency of their own. If you use positive vibes such as bravery and love, it changes 'tone' and cannot be drained, so I am sure this creature could be defeated without too much effort. Like a Cheetah, these predators have to give up if the prey proves too strong, as they have to keep their energy for a few more attacks (against weaker targets). Knowing the nature of your enemy provides you the power to prepare for it and fight it by attacking its weakpoints, as well as covering your own. Its only weapon seems to be scare tactics, so you should calm down and stay rational, though it might try to act more aggressively for some time to scare you even more. You might be able to even shut it out of your vision. I assume you have some sort of occult affinity, probably far greater than my own, but I was able to fortify my consciousness from such beings.
Remember this: if it's physical, you are able to harm it (e.g. with a knife); if not, your battle is against a mere illusion, no matter how real it seems, even if it passes through you, even if it vaguely feels physical as it does so. Be prepared. Try and convert your fear into a marvel at this astounding creature of the netherworld, make t become a form of excitement, either of interest in exploration or battle zeal. Remember that you are a human, made by the image of God, and as a woman, you are the very symbol of raw power herself (this raw shapelessness is what might attract dark creatures to you), and with the guidance of the "prince" in your heart, you can become the graceful queen of the chessboard, or the fiery dragon of the cave that roasts the unworthy from taking the chaste princess.
So try to sleep calm, and rest well. Think about positive things. Oh, and don't meddle with occult stuff. I hope you don't. Curiosity killed the cat, so just stay away from ouija-boards and the sort.
I think this is enough advice to help you. When in distress, pray to God for peace and for the protection of angels.
Talk to your parents. Get somebody to search the house and the area outside, the lock the doors and windows for the night. But it's unlikely that you actually saw somebody. I mean, if somebody had broken into your house, they probably wouldn't just stand around looking at you.
Make sure you're getting enough sleep and proper nutrition. If you're under a great deal of stress, reduce that stress. Don't take any weird drugs. That should cut out most everyday, lifestyle-related causes of hallucinations. If things like this keep happening to you now and then over a prolonged period of time, then consider seeing a psychiatrist, as you might be hallucinating or having false memories. If you have more experiences likely to be hallucinations within the next few days, then go to see a doctor immediately. Visit the emergency room if you have to. Sudden, frequent hallucinations can be a symptom of serious illness or poisoning.
If you've sought medical attention and it hasn't helped, then you might consider seeing a religious practitioner of some sort. It doesn't have to be your own priest. You can wander into virtually any house of worship of any faith or denomination and somebody is very likely to help you.
The human perception is very faulty, so understand that. Although there are many people who belief in spirits, ghosts, etc., and even believe they've seen them, there's been no *credible* evidence to support such claims yet. So hopefully that might put your mind at ease.
If you believe you're hallucinating and these hallucinations continue, you should probably talk to your parents. Have you been stressed? Taking drugs of some sort (prescribed or not)? I can't diagnose you by any means, but if you keep seeing these ghosts and you're living in fear/paranoia, it may be a serious issue.
If you're worried there's a person in the house or stalking you or something of that nature, you should tell your parents or even call the police if it happens again.
Did it say anything to you? Take up meditation. Develop impartiality. Meditation is supposed to make the mind sort of like teflon where nothing sticks to the mind (as someone once wrote somewhere)--things will come and go like reflections in a mirror.
When I mentioned mirror, I was referring to what meditation is supposed to do to the mind...it makes act more like a mirror. Anyways, don't assume the ugly or spooky apparitions are evil. Try and talk to it. Show it respect. If it is rude then tell it to leave.
If you think there is someone in your house, call the police. If you think there is something supernatural in your house, call some family or friends to come over and keep you company, get some Holy Water and burn some sage. I don't know. It would probably take days to find someone you could call to check it out properly. I mean, assuming such a service exists.