Q.Where I fish we never catch big bass...only the small ones bite... Why?
A.There are so many reasons why this could be and to properly answer more info is needed.
What are you using? Have you changed it up? Have you gone bigger? Have you gone smaller?
Where are you fishing? Is it a newly established lake? Is it a pond?
Has it been taken over by an invasive species like snakeheads that are wiping the bass out and they are struggling to survive?
We could go on and on. I guess with the very little info you have provided I would first check the lures you are using and change it up. The technique also. Fish them differently.
Wish I could be more help.
Thanks for your question.