Think I know where my low self esteem comes from

Honestly I’ve never felt like the worst person ever , all my life I’ve always struggle with fitting in and making a good friend group, and I always think I don’t do enough for anybody and sometimes when I feel like somebody is becoming cold or distant I make sure to keep a distant too out of respect or a mechanism to help me not feel hurt , as a result a friend of mine did this and I stayed away because I had no idea what she was going through and my other friend who I’ve met at the beginning of the year I’ve never had a good feeling abt her because I noticed her starting to be really flirty with my boyfriend and when I tried talking to somebody about it , she twisted the entire situation to her assuming I was sl*t shaming her, which I’d never do that is not in my dictionary , so when I arrived to school everyone said she was saying really bad things about me and what’s worse is that she did this two months ago and I found out last week I cried to all of them about it and they ignored me they all laughed and just left me there to cry , I tried talking to my friend who slowly grew distant instead I noticed her getting closer to the friend who wronged me . I noticed all my friends growing a distant , I slowly felt like I failed as friend and then I slowly starting convincing myself i was a failure in general , so as a result, I turned to marijuana and cough medicine, and multiple dealers reach out weekly so I can buy more stuff , and what’s worse is that I know these people are not good friends but I still let them get to my head and on top of that I resort to substance abuse to help with my overthinking and anxiety , I need advice

Tried to have a fun day today but I was too into my thoughts and that just ended up ruining it. Had it triggered by something, which was being in a social environment surrounded by people talking to each other while I feel I can't talk to anyone all that much. Why is this the trigger? Because it's happened in the past, and probably childhood, and I guess it didn't sit well with me and it still doesn't. It completely took my mood away on top of bad habits that hurt my self esteem further. Then when I feel I talk a bit too much, I get no responses, so that's why I don't say a whole lot to begin with. That combined with worrying about being judged. Just a vent.

Adults only as pocd mentioned I'm still thinking abt all the friends online who have unfollowed me,some cases even i think softblocked or fully blocked me. My brain is convinced that I must have done something gross and predatory or I did something racist or in general bigoted and they came to terms with it and left me. I can't stop thinking abt it. I just remembered checking an old discord for a fandom I was in when I was 17,half the people there had unadded me when we were friended and possibly even blocked,I hadn't talked to a lot of them in a long time though,but I thought we were on good terms. I think we also used to follow eachother on tumblr but before I made a new tumblr I remember not seeing their posts after some point and I can't remember if it's just bc I wasn't on much or i unfolloed or I got blocked. I feel I must have done something awful. One of my worst fears is people i care abt or was friends w leaving me and not telling me why,I have so much stuff I did on the internet I feel regret abt and it could be any of those things,as i mentioned i cant stop goint thru old messages and there have been times ive seen me make like a nsfw joke as a teen in a group chat or me not react negatively when someone else in the chat does something weird . I'm constantly scared who the next old friend i have will suddenly disappear one day,letting me wonder if I did something hurtful or predatory or bigoted to them or someone they know. I have so much stuff I regret a lot when i was younger,I have so much stuff I wanna confess but I'd be here all day and I'm bound to forget something then remember it later and spiral.