I have a group of friends who I have been friends with for a long time. We are all very close but also have other friends each - me slight less than them as I am very shy. The one that I am closest too has a new group of friends who she sees all the time. She usually invites me too but I feel that they don't like me much and they intimidate me tbh. The problem is that it's got to the point that I won't see much of my friend if I don't mix with these others. What should I do? I feel so lonely but I just don't want to hang around with them - they make me feel so insignificant :(