Why am I single?

Positive answers, now! I'm 26 and have been single for 6 1/2 years. I've been told I'm a catch by so many guys, of course they're already taken. I'm cute, I'm a sports fanatic, I enjoy the outdoors and typical "guy" stuff, but I can also be girly. I take care of myself and always try to look my best. I have a great sense of humor, I'm not high maintenance, I'm an awesome cook. I'm very caring, attentive and loving. I'm smart, hard working and self-sufficient, college educated, practical. Regardless of how this sounds, I'm also a very humble and modest person and I prefer to give attention rather than receive attention. So what's the problem here? I am a single mom but I know plenty of single moms who have boyfriends or husbands or are at least dating. I don't know what I'm doing wrong.