What instrument do you play?

You don't wear brass. Although it is the bling of the orchestra!!

I play tuba

The sound of the tuba is pretty cool!

I have a big brass, but I have a small ass

Flute

Yes! Perfect choice.

There's a reason I'm debating between 2 others that read bass clef.

If you can learn the bass clef, do it. Having only played treble clef, I had a terrible time playing piano. I was constantly having to transcribe it in my mind to learn it compared to the treble. I wish I had learned both.

I already play in bass clef is the thing.

Then perhaps you should learn an instrument that plays the treble clef. It will serve you well in your future and give you experience to play many instruments.

But my mouth and embouchure are better suited for lower voices.

Ah, that I totally understand. But....if you want to be more well rounded, you might consider the piano at some point. It uses both. Now, that was a wild ride for me after playing the trumpet and French horn. I had no idea what I was doing.

I don't have any finger dexterity.

Dang! Then you're stuck with the trombone. Maybe the triangle?! 😂

It really sucks because I want to take Music Theory where we have to use a keyboard.

Music really does center around that keyboard, doesn't it? if your fingers give you that much difficulty, can you request an alternative way to participate other than on the keyboard?

I also remember my trumpet teacher held a contest of who could play the highest note....my lips hurt afterwards but I won. I have no idea what note I played. It was squeaky. 😄