Still, there was something that was bothering Sam. The tryouts for the tennis team were on the same day as his mom’s birthday, and he knew his family was planning a huge surprise party for her. He didn’t want to hurt his mom’s feelings by missing the party, but he also didn’t want to miss his one shot at being a champion tennis player just because the tryouts were on his mom’s birthday. He was in a quandary; he didn’t know what to do.

What is the meaning of the word "quandary" in the above passage?