Anticipated about joining a new church?

It is a new church that I have never been to before. None of my family go and both my parents are atheists except me. My neighbour also goes there and she hasn't seen me before- so she might wonder why I am there. My parents are lesbians as I am adopted and she might wonder why am I there. It will be really awkard because where do I sit if I am new? What if the neighbour spots me. There are also people from my school there and what do I say to them?