Am I being too clingy/jealous?

I tend to take personally when people close to me like friends don’t tell me something but tell someone else (this could be anything big or small info) even if they just forgot, when I find out from someone else I can’t help but take it personally. Especially when I am known the friend group has a good listener and someone to talk to.

It doesn’t sit right with me and I know it is self centred to think this way and I hate that I care so much about it.

My (18F) gf and I (18F) have been dating for just over a month but have been close friends for a long time. With the shift from friends to dating I find myself trying not to be super clingy and annoying because I just want to know everything in her life and what’s going on. She doesn’t have the best memory and I know she try’s to tell me things but I feel bad for taking things personally and it stems from me feeling like I should be the person she tells everything to.

An example is today when my gf and my close friend texted each other and my gf told her she is thinking of accepting her university offer today. I heard about this from my close friend after school, I instantly felt mad and jealous. I hate that these are my immediate reactions and I feel selfish that I care so much.