Your sexuality is irrelevant, they must be told that your partner and friends must be treated with respect.
You don't have two lives, you have one, and they and your partner are part of it.
I'd talk to them, set firm and fair boundaries.
If you 'choose' them, they will think they can influence all your future relationships. They need to know that you love them unconditionally, but can and will make your own choices.
There is absolutely room in your life, and love in your heart for your partner and your kids. Tell and show them that.
When they are older, they will realise that if you're happy, they're happy.
Right now, they are terribly influenced by peer pressure, so bear that in mind. But that will pass as they mature.
Good luck