What should I do about my jealousy?

I'm currently dating my first girlfriend. I'm 15, and so is she. I'm a 10th grader, she's in 9th grade. There are somethings about her that drive me to the brink of insanity with my jealousy problems. First off, school. She's in 9th grade, but I'm pretty sure she is smarter than me. She has gotten 95's in every cl ever since 6th grade. I get about 80-90's in every cl. She uses little to no effort, while I strain my brain studying. I guess you could say I feel inferior to her knowledge? I'm not too sure, it would be great if someone could explain why I'm so jealous over her schooling. I'm also jealous about her past. I've gotten over it but sometimes it still comes back to haunt me. For her young age she has had four different partners, each about 1 week apart. She has had with each one at least 2-3 times. The only reason she did anything with them is because they either forced her to, or told her they would be together forever and if she really loved them she would do it. I feel extremely jealous whenever I think about it. I realize how wrong it is to hold someones past against them, especially if you know for sure that they have changed their ways! Jealousy has always been one of my biggest flaws. I guess my real question here is, what can I do about it? Her and I frequently talk about my jealousy and she fully respects me for my different emotions based on her past, and also current situations. Not only have we talked about it, but she has ured me that she fully regrets everything that ever happened with those guys, and also everything else that she has done wrong in her past. I accept her for that, and especially for being honest with me about everything. I feel horrible for becoming so jealous, especially in situations where jealousy is the last thing I should be feeling. It's almost as if I don't have control over my jealousy...unlike almost all other emotions. I need some great tips on what to do for my extreme jealousy, and also, some tips on being proud of her for how well she does in school, and not feel threatened because she is smarter than me. All advice is greatly appreciated, thanks!