Ill try to give some actual advice.
I assume you and your girlfriend are on the younger side...maybe late 20s early 30s?
Anyways....
Yall have to decide if you can really do the whole "for better or worse" with each other.
And that means accepting your partner for who they are, the good and well,...the not so good. Dont expect to change someone then realize in 10 years that its not possible...
Either accept each other for who and what you are or move on...dont waste the time.
And I might be in the minority but be prepared to not always agree. And discuss how you can overcome small things and not let them swell into big things and all that heavy baggage therein.
So, I can only tell you that it takes work, patience and making the commitment. But in the end if its right the net gain far outweighs the investment.
ETA. Yall have a child to talk about and plan for as well. And with that, all the responsibilities. And however it works out between you and girlfriend, you need to be a man and father to the child. Children need their daddies in their lives...
And...lastly, I credit my wife who puts up with me and my idiosyncrasies, no small feat...LoL.