I have had this red sore for ages now and I have never had sex and only masturbated infrequently. It's sore to the touch.
Good morning my young friend. I do not know what it is but it looks like to would be very painful. Please go to the doctor. He can tell you what it is and give you something for it. Also if I were you I would not masturbate till you find out what is going on. Your just irritating it
Take care…Ken
looks like balanitis to me