There are many things Thor cannot do on his own. There are also a great many things Thor chooses not to do alone.

"You recall in our youth you dared me to tame the most stubborn beasts in all the nine realms?" He had hoped to prove himself worthy of Mjolnir through the task, but had only gained two large, stubborn, and above all odorous beasts.

"The Lady has set a similar task before me."