I only had a few peaches on my peach tree. Last year I pruned the trees back. I have 3 of them this year and they have not any peaches on them.
No Fruit on Peach Tree
Certified GKH Gardening Expert
It is likely a pollination issue. These articles will help:
It may also be improper pruning. Make sure that you are properly pruning the tree. This article will help with that: