I'm 13 and I love to masturbate?

Heey. I'm 13, male and I love to masturbate. I dont wanna say I'm physically fit but im not fat. I'm thin. Is there a problem masturbating twice a day? And also, I love sleeping naked. Well, not completely naked, I like sleeping with my boxers on. But I think my Dad doesn't like it. Any Advise? Thanks!