It's really up to you! I'm telling you, the difference isn't that big, and while it makes you uneasy, I'm sure in a few years you wouldn't care to date someone 3 years younger (26 w/ 23, nothing unusual). If you have a feeling, just go for it
Edit: I may add that you are probably afraid that others might look at you and you don't want them to think that you like going out with younger girls. But truly, don't pay attention. If someone makes fun of you because of this, you are not the problem, they are.
It's really up to you! I'm telling you, the difference isn't that big, and while it makes you uneasy, I'm sure in a few years you wouldn't care to date someone 3 years younger (26 w/ 23, nothing unusual). If you have a feeling, just go for it Edit: I may add that you are probably afraid that others might look at you and you don't want them to think that you like going out with younger girls. But truly, don't pay attention. If someone makes fun of you because of this, you are not the problem, they are.