I'm really uncertain on what to do.

Over the last number of years I have felt myself slipping into depression, and the worst thing is I don't know why. I really have no reason to feel the way I do. I have a great family, friends and I'm working in a decent job. I try to keep my mind occupied with different hobbies and exercise, I really enjoy them but at the end of the day I still can't help but hate myself. I'm strongly considering going to get professional help, I don't want to feel like this for ever. Im still fairly young (23 male) and it just seems to be getting worse no matter what I do. I don't know why I'm even posting this here, I know this this isn't going to help but I suppose it feels good to write it down and actually address my problem.