Being able to say "No", and being willing to let people down because there are things you need to do that are more important than them, is a really important skill when you're running a startup.

You can't succeed if you're giving up all your time to other people's things. You have to stop and tell them you won't do what they're asking because you're focusing on your own stuff. They will complain. Some of them will stop talking to you. You might really annoy your family. Your real friends will understand and still be there when you're finished. Some of them might happily come along and help you with what you're doing.