time to cut your losses as things will only get worse when you are married. I wouldnt even consider marrying a girl til I was past 25. Neither you or her are mature enough to get married before then.

The possessive shit will get worse.
The offended game will get worse.
She will get far more think skinned in a fight.

None of the good things will get better, they will stay the same or fall off. Every bad aspect will get worse though.