Someone has "dirt" on me and is sharing it to others causing them to change their perspective of me. Is this an illegal form of harassment?

I used to be a bad egg. I've said things on the internet that I now regret but nothing severely offensive i.e. racist homophobic, sexually explicit. Mostly just oversharing in my private life to total strangers. I've learned to back off and not go so much into my private life with people who don't need to hear it.

That didn't stop these things from getting me in trouble and banned from communities of the stream site Twitch because it made others uncomfortable.

There was also a rumor going around that I dated someone very underaged but this is not true. The person in question was 18 at the start of our relationship and people assumed they were 13 for some reason and never bothered to ask.

Fast forward to about 10 months later, I have had three people recently burn their bridges with me. I had a friend mediate between me and one of them and they found out that my now "ex-friend" had information about me shared with them by someone else.

So I deduced someone has dirt on me, or rather screenshots of what I've said, and also possibly bringing up the fact that I'm a "pedophile" and these people are being misinformed with false facts as well as things that are irrelevant 10 months later.

I'd like to know if this counts as harassment? I am being persecuted from the shadows based on "sins" that I have already expressed my remorse and regret for, combined with this ludicrous rumor that I dated a 13 year old. I feel like anything I try to say to defend myself will just make matters worse. Especially on the internet where rumors can spread like wildfire.

Is there anything I can do for myself in this situation or is this really just high school level clique drama I should just walk away from?