Maybe you shouldn't worry so much about your career and future and holy-crap-what-am-I-doing-with-my-life and the student loan debt you're racking up, and just follow your interests. Despite how old you feel, maybe 19 is young. Maybe you do have time. Maybe you really aren't the only one. Maybe it isn't a crisis. Maybe you should grab opportunities as they come, do things, figure out what you like and don't like, and take it slowly. Maybe you can get some sleep.
Just a suggestion. :)