How Do I Become More Motivated?

Okay so a lot of times I feel unmotivated and not smart. I've been to college 3 times but dropped out. I wasn't motivated at all. I found the courses boring especially math, sociology, science also someother courses in the general education field. There were basically classes I took which I found complicated. I feel really unhappy because I'm stuck in my home so I have to go to a community college. There are many bad issues at my house for MANY years, I just wish I could leave but I can't without making good money and I can't do that without any education. When I did my homework even at the library I felt sad and frustrated because I could not concentrate. My grades were bad. It seems like my own mind can't seem to function at it's full potential when I'm in college and I tried hard by studying so I just stopped going to college. My other problem is I don't even know what I want to do with my life. I like working with computers but I don't want to spending my entire life sitting on a chair by a desk, I just also like helping people, it makes me happy. I just want a good job with a great income so I can live on my own one day. People tell me I can just "Move out" they always give me the same advice but I cant because I don't have any money and tehres no way I'll survive on a minimum or low paying dead end job, especially one which id don't enjoy doing. I can't even get any type of financial aid because my dad makes too much money they always reject me and sometimes he pays but I cant always rely on him. my mom doesn't want to pay either she only cares about paying for her own expenses and doesn't even care if i don't go to college or not, she just wants me to work a low paying job but I don't wanna end up like her working for McDonald's. I feel like I don't have much interests as other people which makes it hard to plan a good future for myself. I know what I don't like (Math, science, writing essays, reading a lot). I just want a good job but I don't want to end up unhappy. I'm almost 21 at the end of this month going no where while most people I knew from high school are mostly successful/ finishing up college while I'm sitting at home trying to fix my problems here which will NEVER be resolved unless I leave successfully.

anyways how do i get motivation? I want to beter myself.

I hope you'll be able to tell me helpful advice.

Suggestion:

not to sound too preachy, but the moment you wrote this.
was your first step towards motivation
it comes from within… not this moment. not the next. but it comes.

i would encourage talking to a guidance counsellor at your current school and then a career counsellor (if you're still enrolled these thnsg will be free). You local library 'could' have those resources otherwise there's always the good ol' web.

You are smart, and you have a situation here which you want to deal with (you're intelligent!).
So give school a second chance, look into a communications major or even computer science (this will require some math though). There is tutoring available in most school and libraries.
Explore things deeply… second chances can change a lot.
Talk to people around you, even your parents… don't internalize your frustration.
Paint, run, volunteer, work… enjoy everything you do. or try at least.

Best of Luck