I don't have too much big picture advice given that I'm roughly your age and also somewhat disoriented, but with regards to learning your math: most if not all schools will allow you to take a math placement test to determine where you need to begin in the curriculum. I completely agree with you that taking 3 semesters (a year, a year and a half?) just to get up to speed would be silly, especially if you do in fact have an aptitude for math.
If you've never taken calculus it would probably serve you well to take it in an actual classroom (possibly at night while working?), but trig can easily be self taught from a book. If you need a little extra help, contact the math department of a local university and ask if they have a list of students who are available for tutoring. It would be a small cost to meet with someone once or twice a week to stay on track with your self study, compared to an actual college class.
If you've never taken calculus it would probably serve you well to take it in an actual classroom (possibly at night while working?), but trig can easily be self taught from a book. If you need a little extra help, contact the math department of a local university and ask if they have a list of students who are available for tutoring. It would be a small cost to meet with someone once or twice a week to stay on track with your self study, compared to an actual college class.