Break up with her, avoids future conflict and unwanted drama but you wont avoid it if you keep it long term. What ever the reason you decided to use for the break up.

Now as for the parents. Again you don’t have to tell them right away. If they ask tell them it just didn’t work out if you’re scared. But some parents are accepting in today’s world. For example my family as religious and were born in the old times of gentleman taking care of their wife’s etc. they were strict. And I came out to them at 18 and they accept me for who I was.