<human>: Introduction: 
After 3 years without looking for a serious relationship, I started looking for something more... long term (AKA not a one-night stand or a fuck friend). 
I started dating a girl 3 months ago. She is 5 years older than me, have not been in a long term relationship in 5 years, and she also started looking for something serious recently.

Problem: 
Right now, our relationship is good, we are getting along pretty well and we share some passions in common. Sadly, I've got this feeling that I know we won't last. I know that I will get tired of some of her bad habits and our ways to see the world are too different for a long term relationship. But, at the same time, I hesitate to follow this feeling for a number of factors:

-We both have not been in a serious relationship in more than 2 years, so maybe we are just learning again how to date, open up to somebody else and interact in a couple?

-Maybe it's because the relationship is fresh and we need some time to adapt to eachother?

Questions:
Should I talk to her about it? (but, if we are able to work it out, I don't want to scare her with this); 
Should I follow my feeling or should I wait a little bit to see if it's still there in 2-3 months? 
Is it be better to end the relationship now because, if it ends in the near future, she wouldn't be as hurt as if it lasted 6 months or more?

Can you give me a shortened version of the text?
<bot>: I've got a feeling it won't work out in the long run, should I continue to see if it's a fake intuition or stop my relationship right now?