Girlfriend prefers to talk to other people about her and our issues over talking to me about them. How can I get her to talk to me more, or am I over reacting?

She has some solo issues and we have some problems that we need to work out but she doesn’t talk to me about them. She instead goes to other people. In addition, when something makes her upset, she just stops talking to me. She also lays against other guys(whom I know she isn’t into and they aren’t into her cause it’s literally everyone) but it makes me feel like I’m not doing something right. As of now, I’ve told her we need to talk about what’s going on right now together without outside influence so we can try to fix the gap in our relationship, but is there anything else I should do before and after our conversation? Am I overthinking all this? I’m new to the relationship game so any help would be awesome.
Update: Sorry I stopped responding after a certain point. I read everything so far and have taken it all into consideration. As of now, we’re trying to talk it out and fix our issues. I’ll update this again after we sort everything out and any other advice or ideas would be awesome. Thanks so much to everyone who’s thrown in their two cents to help me out


Source.

That's a huge nono for me....don't go blabbing our business all over the place. That's one thing that'll make me go ballistic.

If she's blabbing to everyone, that's a problem. It's either her lack of maturity or your willingness to listen-maybe both. Y'all need to fix that ****.

Maybe there's a reason she feels more comfortable talking to others instead of to you. That's usually the case...and watch out for these "other men" you think she's not into. JS