I didn't try any drugs including cannabis till I was 19. "Just say no" worked up until that point somehow, and I thought that by trying drugs, I would somehow A) not feel good and B) feel guilty about it. Well I took my first hit of a joint the first day of my sophomore year in college and I felt good (despite the sensation of my lungs turned into toaster ovens) without a trace of guilt, so I just sort of dove in head first from there. Anyway, the point I'm trying to make is that I feel if I would have started doing drugs earlier, my mental capacities would be far from where they are now.
I had my first shroom experience a couple months after having my first taste of marijuana in November, and even though it was only half an eighth, as it turns out I was not ready for that experience. I had another shroom experience several months after, and I still wasn't ready, and I think it was because I had so much teenage bullshit going on that I thought was far enough in the background not to make a difference, but it hit and it hit hard. Once I was able to clean up that background bullshit and start enjoying life, psychedelics became much more enjoyable and I had developed the psychological tools by that point to handle the tricky situations better. Anyway, whenever you do get the chance to try it, I hope you're ready and wish you the best of luck.