2/3 blind structure

[TheGunner]

Currently taking a few shots at 15/30 and the 2/3 blind structure (SB = $10, BB = $15) is new for me. How to deal with it?

I have defended a lot from the SB, almost treating it like a big blind. Is there still the 'rule' 3bet or fold in the SB? I don't feel comfortable 3betting hands like QJ from the SB but I don't want to fold them against a steal.

Also, I don't want to give up the SB as fast as I would do on a 1/2 blind structure when it's folded to me.