What's the right age to do psychedelics like LSD/shrooms?

[ayushjha]

Is there any harm(on the body/brain) by doing psychedelic drugs for a 20 year old bloke?

And how to exactly use them for improving a particular aspect in my life(for ex. how can I use it to deal with my social anxiety?)

[ZZZZ]

I think 20 is perfectly fine. I may have actually been 19 or 20 during my first experience.

Set and setting are most important. Make sure you have a safe and pleasant place to trip, and if you're tripping with someone else, make sure they have similar intentions as you. If you're tripping alone, it could be beneficial to have someone sober nearby, or at least aware of what you're doing for peace of mind. 

Contemplation about anxiety while tripping would be a good start, or later when you're more experienced with how psychedelics make you feel, you could use them in public or small social settings to help you work through the mental aspects. I wouldn't recommend that for your first time or two though, and probably at lower doses.