Is 13 years old too young for an innocent kiss?

You should defer to your family's view on such things.

But most people, including myself, would say it's all just part of growing up, like your first crush.

That said, as you may know, you will like to do more than just an innocent kiss as you mature. I would encourage discussing such things with your family. I worked in the Child Support Agency for many years and saw firsthand the devastation not doing so can create.