What to do if i masturbated 6 times today and my penis is starting to look red should i call my doctor?

No: Just stop masturbating. Perhaps try a little gentle, unscented, unmedicated lotion. Masturbating once a day, perhaps twice should be more than enough at your age. You don't need a dr unless you have fractured your penis. In which case it would beswollen & bent at the fracture site. Your penis should settle down by itself, just give it a little time.