In this world, I've learnt, people will come and go but at the end of of day, you still have yourself. The problem is I'm not very happy with myself, I don't like who I am.

I fell into temptation this evening and after the fact, I just kinda sat there and I was really disappointed in myself, moreso than I've been in a while and I realized that I'm not happy being like this, I want to be better but I don't know how. Where do I even start? I've fallen into a self improvement rabbit hole before where I ended up watching all sorts of useless videos but it sucked me in and it was hard to escape, they were those dumb "pay xxx for this course on how to yyy" and I want to get some practical advice from people that I can relate to this time around.

I'm at a very transitional age, I'm 18 now and I'm moving into the world of adulthood and I want to enter the world of adults as a better man. Can you please help me?