You mentioned a period of three years. What were you before that? What enthusiasm did you have then? What changed and do you know why? It's long for just a phase but then again the teenage years are usually rough on all of us. Untreated depression frequently gets worse . Do the meds help in any way? Medication is frequently not lifelong and can jumpstart people through difficult times. I wouldn't so easily dismiss it. Whoever prescribed it saw something and they thought it would help you. Like one of the posts recommended--you could look at all the other ways to help fight depressive episodes---it might help.

My first episode was at approx. 16 and it took years of me being clueless and isolated to what I was going through, but I eventually came out of it only when a good job came along. There's help and medication much more readily gotten today.