Colo Bob is completely right. Its just math. She is 30% less experienced than you.
Personally, I dont see anything wrong with dating someone 10 years older/younger than you. I have actually been in a similar situation, having dated guys 10-11 years older than me. I liked them because they were funny, established, wordly, and experienced. While I had more life experiences than most people my age, there is no way I could compete with someone who had 10 years on me. Thats why it didnt work out.
Part of growing up is gaining those experiences... and more often than not, you have to screw up to learn.
So you have to understand that dating her will not be easy. While it may be pleasant, it will be equally as frustrating. You are going to have to have a lot of room in your heart for forgiveness, and a lot of patience.
Good luck.