Fading Friendship?

I am best friends with these two people. We always talk about how it's great that we're a "best friend triangle" but lately I have been having some problems with them. They always talk about how all of us need to get together or whatever and then they always invite me over on a date that they know is bad for me or they don't invite me at all. Then next time I see them they always joke about what they did and I'll be like "What was that about?" and they'll say "oh nothing, you weren't there and it's a long story." I feel really left out and uncomfortable and stuff. I know they are bff but I don't know if I am with them anymore. Also, sometimes I miss our Youth Group meetings and trips and they'll like almost rub it in my face about all the fun stuff. We have a skiing/tubing trip coming up and I can't go but I don't want to anyways because my mom got in a skiing accident (she's okay now it was when she was 17) so I'm kind of afraid and I asked them but neither will go tubing with me. I really don't know what to do because I've been friends with them since we were 2. Please help.

-Fading Friendship