Perhaps you could do the organizing. Maybe you could invite your family over for a games night or a meal, or if that's too much trouble, why not organize a get together at a local restaurant? This will show them that you are not dead.
They don't know what to say around you because they don't understand the trauma of this disease and its treatments. They probably love you and want to protect you, and they don't want to hurt you or risk saying the wrong thing.
They do not know the "right" thing to say because you have not given your permission for saying anything at all. I suspect they are looking to you to provide cues. If they see that you are OK and are happy, then they will relax and might feel more comfortable asking the questions they've feared asking.
You can't expect people to magically know what's going on in your head. Sometimes we have to be the ones to provide the emotional education. I know I've seen people do the "if I have to tell you how I feel, then you just don't care enough" sort of thing.
If you are struggling with ESRD and dialysis, and if you need their support, tell them. Have mercy and don't expect them to guess what you need/want. Maybe the first thing you could do is to decide what it is exactly that you want from them. How can they help you? Do you need some practical help around the house? If so, how are they supposed to know if you don't tell them? Do you need someone to talk to, a shoulder to cry on? If so, tell them this.
Give them the opportunity to understand. It would be great if everyone could know exactly the right thing to say and do all the time, but that's just not realistic, and to get what you want or what you need, more often than not, you have to be a bit more specific.
You have no doubt found that all chronically ill people need to be their own best advocates. This is true not only with doctors and clinic staff, but it also holds true with more personal relationships. Figure out what you need and want from your family, and then work to get it. Don't let yourself be left out of anything. Don't make it their responsibility to include you. Include yourself.
I'm sure your family loves you. If you love them, tell them what you think they need to know.