Ante up tournaments betsizing pre

Hey, just wondering what my standard sizing should be when playing an ante up tournament on stars. 9handed, 10$ ante 5/5 blinds, so theres 100 in the pot pre. It feels so wierd cuz most people open for 15-40 which seems way to small imo. Should I go like 100?

Totally clueless

half the pot

ok cheers

Look at the stack of a