I am trying to put a band
But I suck at playing the guitar
My voice is horrible
And the only other instrument I know how to play is the flute.
So I basically cant do much about it
Don’t give up. You have a few choices. You can work really hard on the guitar, and get better. Maybe even get a teacher or books (classical music is like the best for developing technique). Or if you like the flute, I’m sure there are bands that would incorporate one, it’s just a matter of looking. I once heard some guys that put up a rock band (more of a social thing). They had a violinist and it sounded really cool. You could also try another instrument :)
At any rate, good luck!