Im a 21 male, i masturbate rarely,yesterday i was masturbating and when i ejculated i felt very little pain in my butthole(barely called pain,cant describe in words like cramps or so).did bloodtest 2 months ago came out normal but thats before pain?

Sounds Normal: When we orgasm, our muscles contract (often all over - even our toes) but especially in the are around our genitals. The length of time without release probably resulted in the contractions in your anus to be more intense than usual thus causing the discomfort - something akin to having a muscle cramp. If it persists, discuss it with your primary care provider or an urologist.