You're too young to be getting into it, trust me. Let your brain and body finish developing, get to know yourself better. You have many years left to live, you don't need to do it all right now.
Do I regret it? No... what I regret is lack of moderation.
When you're young you don't realize what you're doing to your body. The realities set in once you reach your 30's and you're not a spring chicken anymore. My early drug use involved social scenes where people had the "go big or go home" attitude about everything, which is totally out of line with the HR ethic. But then, I did drugs at a time when old school raving was still flourishing and the average person knew fuck all about drugs. Just saying that it's fine to have fun but also try to honour your future self as best you can too, because your future self is relying on your present choices for his wellness.
I have zero regret about the realizations, insights, and personal evolution I've experienced. People attribute my intelligence to book smarts but I attribute my smarts to doing drugs in creative scenes and greatly enhancing my creative and emotional intelligence. I just wish that someone had pulled me aside near the beginning and said, "Just because you don't feel the harm now while you're young doesn't mean you're not harming yourself."