The right perso you can talk about your work load is your boss

Please understand that you are hired to produce results according to the companies schedule, instead of being trained according to your insterest. After you follow your boss direction then you have freedom to learn or do the things of your own interest.

1.work load: if you feel your work load is more than you can handle, talk to your boss, not your coworker.

2. priority: If simple the work is not what your preferrence, then you need to make sure you are following the priority of your the group, not priority of yours.

3. Learning: If you can handle your assignments, no matter you like or not, you still want to learn more or be involved to projects that are not assigned to you, you can talk to your boss, or learn it by yourself.

Good luck!