Friendships

So my group of friends is me and two other girls and lately i’ve been feeling like i’ve been left out they hardly talk to me anymore and always hang out with out me and i don’t know if i should say something or just leave alone or just leave the group. I also worry about what i’ll do if i leave i don’t have any other friends that i hang out with or anything and i just don’t want to lose another friend i’ve lost 2 best friend in the last two years and i feel like i’m a terrible friend and that i can’t keep any friends.