So I'm 16 with an erection problem I got a new girlfriend 2 months ago already fell in love with her, I get semi hard erections when masturbating and with her when she's scratching my neck etc. I get semi hard erections I always wonder if I'm big enough to please her 5 to 6.5 inches when fully erect 4 to 5 on semi erect.. Mine is psychological all I have to do is get over that "can I please her right" thought right?