Asexual or low libido?

I'm confused, I have no drive for sex with another person but when I get horny my mind automatically goes to maturbation for sexual alleviation. I've had sex and it feels like a chore for me. I don't really enjoy it, I do it just so the guy can get his, and I'm sure it's a buzzkill for him. Maybe I haven't found the right guy yet? Then again I've only had sex with one guy...I don't know, but it's frustrating me more than it should. Can anyone else relate?