Starting sixth form & social anxiety?

Im starting sixth form at a different school to the one i currently go to in september and having social anxiety makes social interaction very nerve wracking for me especially as I wont know anyone there and i worry that everyone will already be in their friendship groups although i know there are some new people going there too from other schools. I was quite shy thoroughout high school and im hoping that 6th form will help me break out of my shell. My main concern on the first day will be trying to approach new people and find a group i would be comfortable with however am unsure how to approach people and keep a conversation going. Can anyone give me some tips about this and how i could become more of the sociable type in sixth form?