Help me!!

So for the longest time i have been the biggest procrastinator, lazy and unmotivated about school work,I care but i just dont have the effort. A few days ago i was offered by a friend who has ADHD and takes Ritalin but didnt like it (it made him jittery and just didnt help him) and he offered to give me some of his own.. I accepted (the druggy i am 420 yolo) and he gave me 10 of the 5mg tablets. So yesterday i took one of them before school just to see how it worked.. In algebra i actually paid attention and did the work in french the fucking worst class (i have a C) i actually enjoyed and tried during class. I could definitely feel a difference in my energy and focus. When i got home i took another one and ripped through my 5 page chem review packet in 30 minutes and did my weather and climate project something i know i wouldn't have done without it.. It seriously made a difference in my work ethic. I want to continue taking 1 before school and 1 after the rest of this week then over the weekend ask my parents to talk to my doctor about getting me a prescription.. The only problem is i have been in trouble before with drugs and abusing stuff i dont want them to get the wrong idea.. Can you PLEASE help me talk to my parents about this?!?