If it was too much pressure, then the tuba mouthpiece will just leave a bright red ring. But for many things, the tuba mouthpiece will cover it (it actually helped me to lose the bad habits I learned on a trumpet).
What I'd recommend is to try a tuba for a few minutes, and see what happens. Just borrow a horn. Don't worry about what notes you're playing, and don't push. See if the bad stuff shows up again.
Even if it does, its fixable, if you're still up for it. I know a bass clarinet player who plays tuba in a university's marching band. If it seems better, still get somebody to start you out the right way, and enjoy the "most noble of instruments". The fact that you're even asking for help indicates you'd be better off with a tuba than a trumpet!




