Miserable Existence

I wish I could be married, and it bothers me. I feel like I am not really desirable, I just want to love and be loved it return. It isn't even about sex, but it's always assumed to be. At times, I feel hopeful, but is always let down in the end. I hate that I desire love, but can't ever hope to obtain it. This makes life a miserable existence. I always feel lonely and sometimes sad. I don't know what to do...