Yes, I do think you are a commitmentphob. But that is your right. However, it is good to stop and think about where this pattern is taking you.

As you get older, fewer of the "top notch" women will gravitate toward you. Women tend to like men who are somewhat older than themselves, but not a whole lot older. (Of course, there are exceptions, but the field does get narrower.) By staying single on into your 30s, you're not racking up a lot of the normal experiences that most people have by the time they are your age. (Marriage/partnership, child rearing.) As you go further into your 30s, that will tend to make you more and more of an odd duck. You'll have less and less in common with your age peers.

I remember that, when I was in my 20s, I found guys over 30 who were divorced seemed to me to be more "normal" than guys over 30 who had remained single. I tended to suspect that a guy in that latter category was a bit too close to either his mother, his guy pals, his wallet, or his mirror.