My man's libido is too low and it's killing me

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My boyfriend has a problem with his libido. We are both 23, but he just never seems to be in the mood for sex. Many times, I am the one who initiates or asks for sex and sometimes he says he is tired or stressed. When we eventually get to doing it, it only lasts a few seconds then it is over. I am starting to feel unattractive even though I believe I am good looking and sexy. Many men want to be with me but I love this guy. I want to help him but I don’t know how. Please advise me. {Leah}