[~Misguided Ghosts~]

I think since there's only a two year difference it isn't that bad, but you should consider whether you two are in different life stages or not. You're in high school and she's still in middle school, and a lot can happen developmentally in that time period. So, make sure you two are in a similar place emotionally and mentally before beginning to date. As with any relationship, make sure both of you are able to consent to anything that happens and communicate with one another appropriately.