Without a doubt, one of the most difficult things about losing fat is eating in social situations. The peer-pressure (from both the ignorant and immature) is the toughest test of your commitment.
BUT... If you want to succeed, you have to lay the ground rules. There is no room for debate. You are either in or you are out.
And you might just surprise some folks when you show them that life can go on if you don't eat chicken wings with them.
So... Be loud and proud of what you are doing. There are more folks secretly wishing someone will take charge and be a healthy role model for them.
It might not happen overnight, but if you continue to lead by healthy example - without preaching or being condescending - you can build an entourage of social support and people who want to be healthy like you.
This will build powerful relationships that will take your health to the next level.