Tow things spring to mind.
Sounds like they are trying to pull you into their peer groups, to be honest.
In one way, this is good, it shows they are accepting you. On the other hand, you may not wish to join thir group. Which seems to be the case. But given they are close relatives, this may cause some conflict of you don't handle carefully.
Female peer groups are more akin to a flat line with a bump where the alpha is. In this case, your mother, probably. As opposed to male peer groups which form a triangle.
The second thing that spings to mind, is they are making things difficult. That may not be as negative as it seems.
In either case, I do urge you to use a lot of tact and intelegnce here. These are sensitive issues and badly handled now, could destroy your relationshps in the long run. If you can, having a relationship with your female relaitives is really important for any girl.