Hey Shannon. Taking stimulants and anti-depressants without some sort of break..... will cause you to get tolerant to the medication effects.
I would suggest taking breaks from your medication from time to time.
Also... perhaps you are being a little over paranoid about your ADHD.... if your teachers are saying that you are doing well... then they arent going to lie about it.
Paranoia is a common symptom of ADHD.... do you often feel like people are talking behind your back?
Well.... thats another common symptom.
Try listening and trusting in what certain people say.... if you are being told that you are doing well.... then praise yourself for it.... dont beat up on yourself and say your not doing well enough.... because you obviously are.