Why do I always end up with the worst tasks?

The simple answer to that is, someone's got to do them! and if you can do the worst tasks and do them well, then you can do any task... in some ways, as annoying and frustrating as it is, the worst tasks are the best to have, they challenge you and push you and tha is the only way to grow and develop as a person :)

Try to talk to people, and explain them why you have to do this task and ask if it would be possible to switch. Make sure to prepare your arguments.

Maybe you are nice and like to help other people, but that could also mean that they think that you will do anything they ask you for. They could even think that you are happy/content/okay with it. It´s important for you to say no when it´s appropiate or simply too much for you. You are no obligated to do every task.

Its like you end up with the worst task cuz i think people think that you that potential which is required in the task so they give you such work that you can handle. God gives his strong warrier the hardest battle.

Perhaps the others are using you to their advantage. Speak out and ask for a task you wish to do, maybe you need to allow your voice to be heard so that you can do tasks you enjoy too.

If you really feel that the worst task is given to u. Then maybe you should have a talk with the person who has given u the task to ask them why the task was given to you in the 1st place. Maybe that person has a reason for doing so.