I started at 20 and if it's a worry of yours I'm still as ambitious as ever and motivated as ever (me trying to convey acid didn't ruin my life-- it's only enhanced it) The biggest insight that helped me at first (especially for someone who also read all the horrible possibilities before doing it) was to lean into any uncomfortable feeling and accept what is happening. Don't fight things, don't hide from things, simply just spectate and trust your body and know that you won't let yourself harm yourself in anyway. Trust your self and the experience.

If a bad feeling is coming up, then it's happening for a reason and it might be time to give it attention. If a bad feeling doesn't happen, then amazing! you'll learn something from either experience :)