JJ on friendly board

[Xizor]

Hello

This is my first post but it's naggin' me so I thought it would be worth making a user for.

I can't get the converter to work so you'll get it manually instead:

Prima 50$ NL
I have ~60$ villain has me covered by a lot. He has been quite lucky up until now, but he is a decent player.

I get JJ in SB. Villain in UTG+2 makes it 3$, folded to me I reraise to 9$ only he calls.

Flop: 7 7 6 rainbow.

I bet 15$ he reraises to 30$

What do I do? I have seen people make these raises with pretty much nothing defending what they put in the pot.
As I see it I only have 2 options:

1. push
2. fold

I don't like either of them so what would you guys do?