This is just the thing, we don't know him. It may be true that he is depressed and/or lonely, but he doesn't tell us that in this thread, the only indication being that he says that his self-esteem can get low. What he is telling us here is that he loves trolling online, that he feels joy from hurting people and it's easy, it makes him feel omniscient. He seems aware that it's not a good thing to do, but he doesn't tell us (in this thread) that he wants to change, or wants to overcome this and stop, or to get help for whatever issue he may have, instead he tells us about how much he likes trolling and how it makes him feel. Now, I don't know him and indeed one can't know what his intentions are or what may be behind this, but I see these statements being made about getting pleasure out of trolling, and having been at the receiving end of bullying and mocking, and once instance of online trolling by a work colleague, I find this triggering and disturbing, and I can't help but react against it.
If there are underlying issues behind the trolling, then
@BrokenBoy needs to try to address those issues, and find another less harmful means of getting his dopamine rush, one that won't cause harm to others or himself. Replace it with something more positive and constructive.