What is this? prostate or hormonal problem?

Hi , I am 22 year old male. I noticed this strange thing when i don''t masturbate for 2 - 3 days or longer than my erections actually become kind''a softer and orgasm is also quite weak and the desire for sex is low! even if times goes up to weak or longer they are still weak erection and orgasm. But if I masturbate daily or soon after second time same day( for example after 2 h ) after the first time before break. The erections are much harder and orgasms are stronger. this kind''a strange because i did''t had this situation in past ( up to 21 year old) it actually was opposite than the longer i didn''t masturbate the urge was bigger and had rock hard erections and big ejeculation when i didn''t masturbate for 3 - 4 days or more, now it''s kind''a opposite ! What could be the cause ? I wasn''t masturbating for week and than had sex with hot girl but the erection was soft and orgasm .... but if I just masturbated recently it''s a lot of better! Could you please explain to me this !