Hi Sam, sad to read your post but yes, sometimes everyone else is busy with their own lives and you dip out. Here's hoping its only temporary and they realize you aren't a permanent fixture but a living breathing human being.
You can't choose your family and we all have some with some pretty big short comings but you can choose your friends.
I used to be big in to aquarium keeping and I have kept a lot of those friends from then online and we still keep in contact. We chat on face book about what's happening in our lives and we do have some good laughs too.
May be you could take up some sort of interest? Never too late to start something. Hugz <3