Help will be appreciated, thanks!
Most Helpful Girl
First of all, are you actually being overly jealous or are there real reasons for your jealousy? Sometimes we downplay what we are truly feeling because we think we shouldn't feel it. If there are actual reasons behind what you're feeling then I wouldn't ignore that, such as if she flirts a lot with other guys. However, if it's more like a guy merely says hi and you get jealous then that is something to be conscious of. I agree with another commenter that jealousy tends to stem from our own insecurities. I used to get jealous super easily when I was a teenager and I've always struggled with self esteem issues. I think it's a combination of age and raging hormones. Also being in a relatively new relationship it sounds more likely. As you and your girlfriend grow and experience things together you'll hopefully build a deep trust between one another and that will help with those jealous moments. Because at the end of the day, even if a guy hits on her you'll know deep down she only wants you.
Most Helpful Guy
It's one thing to be a little jealous, I think that's healthy. But if you're extremely jealous by anyone being around your girlfriend, that sounds like there are self-esteem and securities issues.
My recommendation is that if you're still in school, you should seek guidance from a counselor. Or even visit a psychologist, someone who can help you understand why you become jealous when your girlfriend spends time with or is around other people. And then the counselor or psychologist can help you solve or improve the reasons that causes you to become extremely jealous.
You should also talk to your girlfriend about it, but let her know in a way that shows her it's an issue of yours and that you're working on improving yourself. She may be willing to talk with you about it. Just make sure you give her space in all things, and never show or act on any jealous feelings.