I sorry but nobody can really help you find your own purpose. That's your job.
But i can make comments about other things. Its tough sometimes to commit to something not everything is going to be a clear cut road for you. Sometimes your gonna get scared, its gonna look hazy and difficult. But if you really want that particular thing you gotta stick it through. That is how we all become successful, through perseverance passion and dedication.
Art is a difficult field to do and hard to be successful in, your going to have TONS of times where you feel like your not good enough or don't want to do it anymore, like its all pointless. That is why i never went to art school and decided to major in computer science instead.
Put some time into it after work and on weekends. YOU make the better you. School is useful since it gives you tools and peers but it can't make you better by magic, you still have to study relentlessly. Which is something you can start on right now. Do things outside of your confort zone (I see mostly heads in your gallery, I assume you can do more, if you feel insecure about the rest then that is a vector to consider your progress for example) and consider what it is you want to work with or what the thing is that you aspire to do.
Want to work on movies? Illustrate a kids book? WRITE a kids book? Make comics? Work in video games? Illustrate anatomically correct watercolor birds for bird books? Just being able to live on art period? I don't know. There are a ton of things to do out there.
Don't give up before you've even started! You try and you fail and you try again and you fail and repeat a few hundred times and then you make a win and you go at it again because you love it.
Might help if you make the artwork for a more short-term, definite purpose, like a volunteer painting for charity holiday cards. You gotta go out and find some kind of short-term purpose that your art could serve, and that'll get you up in the morning doing art. Even though some of them may not go into your portfolio, the fact that you're getting up doing art for some goals will help steer you into a more driven mindset so you can create your own work.
imagine this: you were walking trough corridors that would lead you from room to room, with each one of the rooms with a seperate function. now you suddenly stopped walking and took a breath by walking out from one of the venting shafts and found yourself in front of a wide horizon and infinite sky. that confuses you naturally. we fail to notice the flow of life by moving on and on non stop. but as soon as we stop and look around we see the great immigration. this is what happens to you. use this time in your life to gather your thoughts and focus. if you take advantage of every single hour of a free day you will see what you can really do with all this time in your hands.
I do have a job, I'm a barrister 5-6 days a week for 6-8 hours a day. But its just all so pointless and repetitive. I kind of feel like when I'm at home, I'm just wasting a day doing nothing, but when I'm working i feel like i should be at home, filling out applications and working on my portfolio. I'm probably complaining more about this than i should. I guess its not really a big deal - I mean i have a job and a house and food and stuff right? So i should just be content.