Difficult question. First you have to learn to say "no". It is not your problem, it is your companys problem. Often they ask just the people for a job beause

Difficult question. First you have to learn to say "no". It is not your problem, it is your companys problem. Often they ask just the people for a job beause it is easy (yes yes I'll do it) or because they do it better than others .. so even it is not really your job, they ask you because you do the job better then the people who really should do the job. Just keep in your mind, you work out of your free will in your company. If you have several projects all on the same time, it does need a bit self discipline. Do finish a real task on a project and not start on each project something.