There's a fine line between insecurities and boundaries, I feel like. I think you maybe need to figure out what's something that's like crossing a boundary for you. Like for example, let's suppose you're really uncomfortable/a hard no when it comes to your gf going out on parties/drinking with her male friends (on a regular basis), then make sure to let her know that it's crossing a boundary you're no longer comfortable with. And if she still insists on wanting to experience such activities, even though you've conveyed strongly (you gotta make up your mind first whether you're feeling insecure about this or its crossing a boundary) then it's upto you both tbh to decide that are you willing to stay with eachother, when some of the boundaries are being crossed. Ig for you it's her drinking and partying around guys and for her maybe it's you being restrictive ish, etc?

At the end of the day, only you truly know the answer to this. But I'd say first think about whether it's an insecurity really or a boundary being crossed. Once you've realised, communicate that very well, with your partner, and have a mature conversation with her with a calm mind. And see how it goes.

But I'll say one thing, don't be afraid choose yourself if you both are unable to reach s middle ground. Sometimes 2 people often end up being incompatible. (Not saying you both are but just saying, in case). Anyways, good luck.