I feel bad after masterbating

For a while now, after I masterbate I'm not happy like I usually would be. It has nothing to do with me thinking it's bad or wrong that I do it because I know it's perfectly normal, but I just regret it afterwards. I've been restricting myself from doing it but I tell myself that maybe it will be different this time. What could be wrong? Is it a sign of depression or something? Idk because I think I'm an overall happy person. What do you guys think?