Make it fun, than just informational. Have a theme or something that is unique to your channel.
I feel unmotivated to start my own YouTube channel for math videos, but I feel that my videos won't get watched since there's many popular math channels out there already. Any suggestions/comments?
Just because the other channels are popular doesn't mean you can't give out better quality videos. And explain everything better. Of course you're gunna help people and they will watch.
Yes, get motivated. The people who make it, they don't worry about what everyone else is doing. They create their own way. If you already know what is out there, figure out a fun way of doing it that you enjoy, that is different. Try and stand out a little. Be unique to you and don't worry about getting lots of followers right away. If you do good, they will build in numbers!