If going into the military is your desire then do it. It's your life to make. My family when I was young were against my decision of going into law enforcement because it was a dangerous job, but I did it anyway because it was my passion and I wanted to serve. Get a reason to join and do your best is all I can say, but I will be proud to have another dedicated being in our air force.
Also ignore the bozzo under me because he/she doesn't know what he is talking about.
Ha...haha... You really don't know how much physical and mental training goes into the military, do you? Lets see you work on nuclear technology or space programs. How bout flying a plane or working out strategy in the field.
Actually, physical training does apply to military.
As for the mental side- 90% of the training is about killing the thoughts and dragging instincts in the place. Every repetitive action is about that. To stop thinking about it and do it mechanically. Because in the combat situation, most of the people freak out when they have to think about anything. So instead, the military relies on instincts, which are quick and reliable. They can be taught, and that's the difference. You can't make a dumb person into a great strategist, but you can stuff him with some reactions which you consider right in a certain situation.
As for flying a plane or working out strategy- flying a plane applies here too. Hours in simulators and hours of training the same things. Remember- As you perform something over and over and over, you stop thinking about it and do it mechanically.
Working out a strategy- people in the field just follow taught patterns, it's HQ that comes up with everything related to logistics.
And military people are one of the lowest IQ bearers among people, sad but true.
Have you thought about doing Air Force ROTC? It would allow you to get a college education and start a career in the military at the same time. It would help you pay for college to boot, if money's a concern (and even if it isn't. Scholarships are fantastic, regardless!). Plus, if I'm remembering my facts correctly, your first two years in an ROTC program are sort of like a trial run, where you're not really beholden to anything or anyone if you decide that the military life isn't right for you after all (though if you drop out, I think you do have to pay them back whatever tuition they've paid for you so far).
Don't take my word for it though, because what little I can say about the program off the top of my head may not be entirely accurate. But still, it might be something that could serve as a happy medium between you and your dad, since you want to join the military but he's not so sure you'll do well.