Parent - Teacher Evening

I've got parent's evening tonight- where I must sit between my parents and each teacher to discuss non other than me. What Am I Supposed To Say? When they praise me- "Thank you" and when they criticise me- "Sorry". I wish I didn't have to go but it's apparently vital this year as I must choose three A level subjects that will basically decide my life afterwards. How does anyone make that decision. It's so permanent!
I really wish some of the teachers would ask me my opinion of them and how I feel they have performed as a teacher this year. Then I could say (to one teacher in particular) "Well you're a bit of a knob really. To be fair, you're middle-aged with a kid but still, that doesn't mean I resist resentment towards you-I'm not that understanding. You pick your favourites in the class- which is a natural tendency and all teachers do- but yours are usually the loud students because they take the least effort to get to know. It's damn-right lazy and disrespectful." I know who my favourite teacher is- Miss Browman because she actually thinks I'm clever and is encouraging. I got off to a bit of a rough start with her though- I always do with the young ones. I guess I get confused and treat them like a friend because they're so close in age. You can never let on that you like a teacher though because it ruins everything and most teachers are weird and uncomfortable about the professional student-teacher relationship. To be honest, I don't know where the boundaries are myself.