I did a "people search" on an online friend and now I feel like a freaky stalker and idk what to do

it’s just curiosity!!

You know that people Google other people all the time out of curiosity. Doing something to prove you’re not a stalker would be a compulsion. Instead, try accepting “I might have behaved like a stalker, I’m not sure.” A therapist would probably assign you to regularly search for information about online friends as an exposure.