Why does hurting myself make me feel better? Should I stop hurting myself or is it the right thing to do?

Hurting yourself is your way of coping with everything that is going on at the moment. It's not just something that you can stop- if you had an easier way of feeling better you'd have done it right? Seek support for this and people can help you to find better ways of coping so that you don't have to hurt yourself to feel better- you will have other things that help you to feel better too. It's a difficult process, but it will be worth it in the end. Speaking as someone who has been in a similar situation to you.