Being wet or cum?

So whenever i masturbate i always get wet and im pretty sure i climax. But how do you know you came if your already wet? Also...i used my clit so whenever i get to what i think is my climax it starts to feel good but the it starts to pulse and hurt. but not a bad hurt, just like an unbearable feeling so i stop. But others have said that if you keep going you get an even better climax. So whats your opinion on that...does that happen to you too and do u keep going or not? And how do u tell the difference between just being wet and coming?