Not had sex in a year - starting to go crazy

I'm 21 years old and female. I came out of a relationship about a year ago, after losing my virginity in that relationship. About 6 months after that relationship ended, I started really craving sex or at least being with another person. One night stands aren't something I feel comfortable with, so I tried to get back into dating. I got knocked back by two guys this year, which completely shattered my confidence. One of them was generally a bit of an idiot; the other one was just a really awkward kind of guy. The last time, I was drunk when I got knocked back, so I actually hinted, "look, I'm not a clingy kind of girl. We can just hook up if that's what you want." He completely recoiled. A female friend later told me that most guys won't turn down random sex, which made me feel terrible about myself - I felt repulsive. I got knocked back again this week, but in this case I was much more reserved about the whole thing. The guy was definitely into me (dropping me massive compliments about various aspects of my intelligence, when he hasn't spent anywhere near enough time with me to know these things). I suggested a cinema date ("I'm so scared to go see this zombie movie, I don't want to go alone, yadayadayada.") He ummed and aahed about going and then sent me a really lovely message saying horror movies weren't his thing. But note, no suggestion of an alternative activity, so it was basically a rejection. I didn't go for him just for his looks (no offence to the guy but while I am physically attracted to him, that's not why I went for him; I fancied him for how nice he was to me and his personality). He's a very quiet and awkward guy, and doesn't have any girls going after him as far as I know. Just to point out, my last rejection before this was in January. Since then, I'd played the whole "wait for guys to come to you" thing. Nothing. I only tried again because I was convinced this guy was into me. I'm just feeling so downhearted about the whole thing. I do masturbate but it's just not the same, and I've stopped doing that out of frustration about it being my only outlet. I'd say I'm average-looking and I have a fairly nice personality, but there are certain characteristics that I know put off guys. I'm very short (5 foot) and have very small breasts. I don't really dress to "reveal the goods", because I look a lot younger than 21 and so it doesn't look quite right. I do have a bit of a complex about how I look more 16 than 21. It hurts that guys are put off by something I can do nothing about; I can't make myself look older without looking ridiculous, believe me, I've tried. I can't make myself taller, and I can't make my boobs bigger without cosmetic surgery, after which I might not attract guys because they want "real" assets. I thought this guy this week was definitely into me, but apparently even he thinks I'm not good enough for him. Advice? How to get out of this mess? I feel as though I'm going to be single forever and I'm starting to really really hate my appearance.

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