There are countless things you can do.
There are numerous things you want to do.
There are several things others expect you to do.
There are many things you think you are supposed to do.
However, there are only a few things that you must do. Focus on those and avoid the rest.
In depth: Take my three-part course on time management—time logging, time analysis, and time budgeting. See also my 10-minute “Dash” technique to overcome procrastination.