I like to do a lot of things that are obviously related to my sexuality, how do I stop?

Hi guys. I am a 22 year old insecure, introverted and lonely guy. I have a strong pressure of sexual energy that I constantly need to release. I've been a porn addict for many years now and the only times that I feel really good and happy is after masturbation, which I do almost everyday after a long day of work. I also like to do a lot of things related to my sexuality, which makes me feel very ashamed. I've been considering a lot about receiving professional help from a therapist and I would like to know a little more about how a therapist would help me with my situation. I hope I can feel better. Thanks