What should I do? 14M-12F

I have a crush on a girl that is in 8th grade but born on September 2013. I am going to freshman year and born on August 2011. I like her a lot and most likely she likes me too. We have a good relationship and I am wondering if I should take the next step. My problem though is the 2 year age gap. What should I do??? 14M-12F