Is distracting yourself by doing activities you like considered a compulsion? I didn’t think so. You just can’t ignore your obsessive thought right, just accept it?

It depends what your intention is. If your intention is to "get rid of" or escape the unwanted thought it emotion, that's a problem. Using distraction that way, especially if you stop doing what you were doing to switch to the new activity, quickly becomes compulsive. If your intention is to improve the moment while you have the uncomfortable thoughts and feelings, or to engage in the activity to prevent you from doing mental compulsions, that's a positive

It's good to keep up positive and healthy activities as regular habits. If you tend to do them at times when you're trying to get rid of thoughts and feelings you don't want, it's probably an avoidance compulsion. Even for people without OCD, maybe they find playing video games fun and relaxing. But if it's their go-to when they're supposed to be doing homework which is making them anxious as they're scared of failing, that's when it's being used as avoidance and isn't healthy, it's maladaptive. It's better to process those feelings and get to doing what they need to do. Also as in this example, compulsions can often create self fulfilling prophecies.

I don't think it is, activities that give you pleasure are good for your mood and your Health.