Is it normal to be single for two years...

I've dated a lot in the past but most of my relationships have been with men I barely knew who asked me out and dated for a couple of months, then dumped me after we had sex. After continuing this pattern for most of high school and college, I finally decided to get a little more wise about my dating habits. Well, not only have I avoided douche bags in the past two years; I haven't had ANY romantic opportunities whatsoever. In the past, I was constantly complimented as attractive, and I've gained maybe ten pounds (going from extremely thin at 105 lbs to healthy at 115 lbs) and although this weight gain has made me self-conscious, I think it's absurd that men would cease to find me attractive because I'm no longer skeletal. Is it normal to go two years without getting any compliments/dates? Do you think I've suddenly become a useless "old hag" at twenty-three, or is it possible I've started unknowingly giving off signals that I don't want to be bothered or that I'm insecure? Is it normal for seemingly normal college aged women to not have any love life whatsoever? Help!