He's never in the mood

My husband never wants sex. Like ever. I have to BEG for it every time. It's gotten to the point I'm tired of begging so we just don't have sex. Since January we have had sex 4 times.. valentine's day, my birthday, and our anniversary is all in between there.. and yet we only had sex 4 times. I just hate it.

He always just says he's "tired" and he does work hard so I try not to get upset. But he promised me when we took our vacation (this last weekend) he would make up for all the missed sex since he wouldn't be working and wouldn't be tired. In 3 days in a unbelievably romantic place we had sex ONCE.. one time. And he came so fast that it lasted 2 thrusts because he hadn't came in so long. It was such a disappointment. I don't know what to do. He's not depressed.. he's just tired he says all the time. But why couldn't he have sex with me on our vacation ?? :(

Am I alone? Does anyone else have to beg to have sex?

It makes me feel so bad about myself. Before the wedding we had sex 4 times a day, 3-4 days a week! Is he just tired of the same old vagina now? I mean we have been having sex for 4 years.. but we ALWAYS are trying new stuff. There's not much I say no to in bed. I try to look pretty for him but I have gained some weight since the wedding. I just don't know.

*and yes, I have communicated with him on how I feel. That's why he said he would make it up to me on out vacation. I've brought it up many times. He just explains he's tired. Which I totally get. He works hard. But I need some love too..right?