Are you late on the guy that calls you everyday's project? Did he add requirements to the project? If either of those are correct then you are within your right to polity tell him to back off.

The website upload guy is easy, give him the number of the server guy and tell him to pay the bill, you are in a third party situation there and you need to remove yourself from it. The bill needs to be paid, before you can perform your task, unless you signed up to manage the project, it is his issue to deal with.

With the student projects you need to get those done if you have committed to it, you need to set aside some time and complete them.