pocd / reocd || scared of being a groomer

i’m an autistic 21f and i made friends with someone who was almost 18f online (literally a couple months away). i didn’t think much of it at the time since she was almost 18 and was already in college, working, doing adult stuff and we got along really well. i live at home and am not in college or work right now because i am disabled and living off disability. so i’m very socially stunted. i was excited to have a friend because i was struggling with making online friends. we became pretty close friends and would talk all the time. we bonded over shared life experiences, opinions, fandom stuff, gossip, our art, etc. i never spoke sexually towards her, pushed for romance, or trauma dumped on her. we just had a really good connection, genuine friends. everything i’ve read strictly points away from grooming. then i realized it could look bad, and i stepped back slowly after i’d say 2/3 months of being friends with her. she’s 18 now after i mostly left. i am terrified because of all the discourse about adults befriending minors. i am so scared that i have harmed her or that i will get called out for it and lose all my friends and my art career online. that’s my ocd and it’s been KILLING me. ive barely slept or eaten. i’ve been doing compulsions for months. now i will never befriend another minor again, and minors in general scare me. i’m so so scared that just because i met her and treated her (mostly) equally before she reached that legal threshold that i have harmed her in some way. i’m considering deleting all my art accounts and never posting again. ditching all of my friends and my girlfriend even before they can leave me. i’m in erp now but it hasn’t quite started yet. this sucks. i just i wish i could go back and undo it. or that she was just a couple months older when we met.