Will I get better

This is probably stupid but I’ve lately come to terms with some toxic behavior I’ve exhibited. I’ve had horrible falling outs with people and I only recently realized what I was doing wrong. I was being mean, insensitive, manipulative, and more. In general it was a bunch of really self destructive behavior. I know it’s insane to say I didn’t realize what I was doing wrong but to put it simply, I’m very much a product of how I was raised. I’ve been acting just like a few negative influences in my life and I had no clue they were bad influences and were treating me bad because I had just accepted it as normal. Well now that I’ve had people point out to me everything, I want nothing more than to become a better person. Now that I know what I’ve done wrong I know what to work on, I’m even trying to get professional help for it all. However, I keep seeing people talk about how people never change and no one is deserving of redemption. I’ve seen tons of posts saying that no one changes and everyone who has done wrong deserves to suffer for the rest of their life. I feel so horrible and now I feel like I can’t get better.