First of all let me say, I think you need to be a certain kind of person to do drugs without it effecting your life.
Ok well, first of all I thought the idea of cigarettes were cool when I was 12, then sometime later while I was 12 I tried weed like 3 times, then by 13 I was smoking weed a couple times a week, then 14 and 15 I was smoking weed daily and researching other drugs on erowid that intrigued me. So I realized the older I got the more people I was meeting, the more drug culture people who some of which had access to other drugs, so when I decided I wanted to start trying psychedelics because ever since like 3rd grade when I saw D.A.R.E stuff they intrigued me, I was 16 and started seeking them from my friends, mushrooms I tried a handful of times, also tried dxm and nitrous in that time.
Now I'm 17 and I've really enjoyed smoking weed, doing acid every once and awhile, ketamine every once and awhile. I sort of want to try MDMA but I dunno.
Oh yeah, also when I was 12 I tried seroquel