At least at the moment you cannot pick your own team but it's a good idea keep an eye on this post in case any changes are made to the feature. Check out Fantastic Five conversation here.
Sounds like a lot of players are unhappy with their teammates. l have had a range from fantastic teammates to total non participating teammates myself.
Every day I play. Sometimes I complete three or four levels and get 0 points for it. I have complained many times to no avail. You may think people are not playing, but believe me I am playing, but very seldom get credit for the levels I complete.
I completed the whole thing with next to no help!! So i know the feeling Everyone. Definitely not fair that they get the boosters that I then they work for 🤷♀️