"Friends"

I have a lot of "friends" at work and from school but they aren't people I go out with and talk to about very personal things. I feel like the people that I'm good friends with don't care. When my dad died my best friend txt me once to see how I was doing and the only time I saw her was at the funeral. We hang out maybe once every few months because she always blows me off when we make plans. It also seems like we don't see our friends unless we invite them somewhere. We don't get invited to anything. I just don't get it. I feel like maybe there is something wrong with me. I don't know... It's just really hard on me feeling like I've got no friends and no family.