My friends excluded me, help?

i spent most of my youth as an outcast and im very familiar with how it feels to be left out. the best advice i can give it to tell your friends how you feel. tell them that you are wondering if you have said or done something to offend them and would like to make it better if you did(i don't think its you fault but by asking this they won't feel like you are accusing them and will be more willing to talk). if they won't talk about it then it may be time to make a few new friends to hangout with when the three of them are together. it sounds like the three of you have known each other for a very long time and over time people change which will of course change the dynamic of your group. i really feel for your situation and i wish you lots of luck talking to your friends!