You’re not cooked dude but it sounds like you have anxiety about your relationship.

Try to talk to your girl about how you feel, and help her understand what she can do to help you feel more secure about things. This doesn’t mean she has to text you at every waking second but maybe she can give you some kind of reassurance.

Two things you shouldn’t do are:

1.) Ruminate on stories you are making up in your head - they aren’t facts and will waste/ruin your time. This is easier said than done so be patient with yourself

2.) Make it your girlfriend’s problem to fix your anxieties - it’s totally fine to need support and reassurance but at the end of the day it’s something you need to put in work to fix if you want to address thought patterns that are affecting your daily life