You don't say how old you are, which would have helped this post a lot.
I was 26 when I got saved, but my parents saw immediately how much better that it was for me that the wild hippie that I was. I gave them Bibles witnessed and prayed for them from that point on. It took 30 years before my mom accepted the Lord, and 31 before my dad accepted the Lord - 5 months before he passed away.
I think you need to show the love of Christ, but also be firm that you are not going back to the way you were. As for staying out till 10:30 was it? Yikes! If you are an adult, they should not be complaining. And even if you are an older teen, I cannot see why they are getting upset about that time.
There is an element of persecution here, so pray for them and for your situation. But don't fight, just be firm!