How do I tell my dad that I love a guy but I don't Want him to be in trouble cause with did sex? And I'm 15 and his 20 and he still next to me.
The feeling is NOT mutual. You may be ready, but he is using you. Also, the age of consent is 16, so you are too young. And he is over 18, so he should be in prison for that. Leave him. Get as far away from him as you can and don't look back.
You decide to tell when you are ready to risk the 20 year old being charged with the statutory rape of a minor. Other than that you stop having sex NOW with an adult who should know he is committing a crime.