Oceanchic -
I have a daughter about your age and she was diagnosed with ADHD when she was in junior high. It wasn't just a decision to start throwing drugs at her, there were lots of steps the Doctor had us go through before putting her on Ritalin. We did a placebo study, and her teachers had to fill out a questionaire about how she was doing in class.
After she was placed on Ritalin there was quite a difference in her ability to concentrate, however, she still struggles with her ADHD every single day.
Never be ashamed of who you are. When people point fingers at you and cluck away about how you should or shouldn't feel, pay no attention to them. You are obviously doing all you can to be the best person you can be. If being that person means needing to take certain medications, then that's between you and your Doctor.
I see my daughter struggle in a highly stressful job, and know how hard it is for her to be successful. I have every faith in her, as I'm sure your mother does with you. The struggle is hard, but the results are definitely worth it. Somewhere out there is the answer, keep seeking it. I know you'll find it.
In the meantime, I wish you the best.