All my cousins are around the same age there are about 15 of us between 21-35?

Long story short i used to b a part of it, bad crap happened im no longer a part of them, wasn't my fault. They hang out all the time have party's together n i have been banished. It has been 3 years and they couldn't give a F about me but it still kills me that im not a part of it. How do i get over caring and no longer want to be back there. Any suggestions, im over feeling like im missing out ???????????????