I should be studying right now, but everytime I sit to study, I can't sit there long enough, I want food even though I am not hungry, I want to watch TV/youtube, self-pleasure... etc...
No matter what productive work I want to do, I will try to not do that and do something which gives me momentary pleasure. I want to masturbate, eat lots of food even though I am not hungry while watching TV/Youtube and I don't seem to be able to break the cycle and it's destroying me. How can I break the cycle and do something good for a change instead of pleasuring myself in the moment meaninglessly?
You need practice at concentrating on your work.
In the same way you'd work out to build muscle strength, your mind needs regular training to stay in shape.
Start with sensible, achievable goals and improve over time.