Don't let your age concern you! What should matter is you are holding out for the right reasons. Also, think maybe about your expectations and beliefs of how it should be before giving yourself to someone.

If it's something you actually want and not something you think you should be doing to fit in, then something is wrong somewhere, but I promise you it has nothing to do with your weight or what you look like!

I don't think any of us can tell you why it hasn't happened...you need to do some soul searching and figure out if its something you really want, and if you do want it, what could you change or adjust to make it easier?