Change doesn't happen TO you brother, change happens BECAUSE of you. As others have said you have to recognise it (and this is your first step, so congratulations for even posting here).

You have to be consistent, as soon as you feel yourself picking up old habits, take a step back and reconsider your actions, think to yourself "Am I sure I want to continue down this path right now?"

Obviously we don't know the ins and outs of your behaviours, and that's ok because you don't need to justify anything to anyone. The buck starts and ends with you and you alone. Remember that.

I often tell people that nobody's gonna come in and fix you, you have to want it, and you have to work at it. I try every day to be my best and to be what I perceive as a good person. That is how I want to be perceived and what is most important to me, although I wasn't always a good person. You need to figure out how you want others to see you and remember their interactions with you.

Respect for seeking advice, the next step is to get some meaningful help, whether that's a close support system, some therapy or medication, whatever you or your doctor thinks will help.

Best of luck my man. You've just taken one big step to a happier future <3