Feel like I'm the only one contributing to the group

I added a few people who I met in class (hard to meet people since everything is online right now) to a group chat so we could work on HW and share ideas and all together. But looking through the chat history I feel like I'm the one doing most of the sharing. I don't mind helping but also do not like the fact that I'm the one figuring out most things. Idk if I should start lying about having not done a particular problem set yet so I can also give them time to do it first and share. Because I'll have a hard time saying no if they know I've done it already.