I would like to tell you a few things as I can relate myself with you.
1) stop living in the future "would I gonna get any girl in future who will satisfy my expectations"
2) you're not being stressed, you're over thinking.
3) stop overthinking and start living your life, you will automatically get to know whether she is the one for you or not.
Subsequences if you don't stop overthinking
You will end up making your relationship dirty.
It would end up being stressful for both of you.
She is nice and sweet today, what if she is in stress and not able to give you time? You would end up overthinking more and your benchmark and her behavior would be more stressful, you would end up being someone which you're not.
First, you need to understand yourself first, in order to understand the relationship.
Hope it would help, best of luck