first relationship

Hi all! I recently discovered that I'm lesbian and not just bi and very quickly got into my first relationship with another girl. things are amazing for the most part, she's so sweet and I love her so much but I am struggling with insane jealousy. For example, when she goes out drinking with her friends, I want her to have an amazing fun time but I am miserable the entire time. I want to be included and I'm jealous because she has a great support system that I have never had. It's almost like I wanted to find someone who is just as alone in this world as I am so we can have each other, but it feels like she was just looking for another part to ADD to her big world whereas I was looking for my entire world.

I'm worried I'm not emotionally mature enough for this relationship but I've waited for something like this for so long I don't want to give it up. can anybody relate to this and if so, what helps you cope with the jealousy that you know isn't reasonable!! I love her and I can logically say "yes I want her to go out with her friends and have fun" but it ruins me and I don't know why!!!!