Dude, you're 20. Go back to school and get a freaking diploma. Take those 4 years to figure out what the hell you want with your life. After that you will be.. what... 24?
Life haven't even started yet kid.
Life haven't even started yet kid.
My recommendation is spend those four years working in as many different fields as you can get your foot in the door. Just try a dozen things in two years. Guarantee you will have a much broader view of what is possible than holding a diploma. Plus, you'll get paid for doing it. PLUS, you'll meet (and build relationships) with a lot more people. Particularly if you aren't good at just striking up a friendship, working alongside people is a great way to get to know them.
Your milage may vary.
The possibilities frighten me and excite me at the same time.
Add to that that you'll learn a shared vocabulary and 'way of thinking' which will allow you to communicate better with those connections.
So if you want to know what to study, just ask yourself which company of graduates you would like to belong to.
It'll also help with that sense of identity you felt you were missing.
1. Don't get paralysis.
2. Pick something that gives you good career options. The rest are your hobbies (and it's good to have hobbies).
4. Be cautious taking on any educational debt -- make sure it's worth it.
Your career will take many turns but you want your opening move to be strong.
Frankly, if you can program and enjoy math, your future is bright. When you love your work, you won't need the escapism of substances.
I believe most institutes allow you to change your course(s) and even transfer over to a different program altogether.