I feel like my friends don't invite me anywhere...what to do?

It's a group of six. Half always are out the house sneaking behind their parent's back because they aren't around and they're the only child. The other three (including me) are very family oriented and we have a big family so we usually do things together. My friend friend from the other half of the group seems to neverrrr ask me to be apart of any plans and its mind boggling to me because I've known her the longest. It's never a text saying "hey wanna do this?" and last weekend I asked her if she wanted to hang out and she told me she might be with this boy she met and our other friend from the other side of the group. I notice that the only time she asks me to come "hang out" is when she's bored, home alone with nothing to do. Usually on Sundays. So I'm thinking am I just some dusty toy you pick up when there's nothing left to play with? I don't know how I should approach this situation because at this point I want to cut a lot of people out of my life. I know who I want in my life but me and my other friend from the family oriented side of the group said she feels the same way and the only time they talk to her is when it comes to a ride.