Maybe it's your recipe. I have one that has never failed.
1/2 C. butter-softened
1 cup sugar
2 large eggs
1 1/2 c. flour
1 t. baking soda
1/2 t. salt
4 medium to large really ripe bananas
Cream together butter, sugar, and eggs. Add rest of ingredients. Bake in greased & floured pans at 350* for 40-45 minutes.
Makes 4 small loaves.