Why cant I have strong s with men but when I masturbate I have the best s, mmmm :)?

I'm a female and i masturbate 3 -4 times a day, I love it and it feels so good, But when Im having it takes me forever to *** like I really have to concentrate and when it finally happens it's not as great as when I'm alone...Usually I can reach climax in 3 minutes on my own, with a man over an hour can go by then nothing, So what I do is fake the ...cause I feel guilty..Sometimes I would much rather me play with myself while he sucks my , I really dont need the ....Whats wrong with me?