Hi, i'm 13 years old, and I often struggle with unreasonable feelings of jealousy. Whenever I see my girlfriend with another guy, or when she talks about a friend of hers that is male, I become very jealous. I have no reason whatsoever to be jealous, and she has never given me a reason to be jealous. I never show my jealousy, of course, and no one knows anything about this, but it's very irritating and usually ruins my mood for a few hours.
I'm curious, how can I overcome this?