Hunger Games last part

I have now finished the Hunger Games Trilogy and am very sad about it as it was a fantastic series. In the end peter returned to normal and Katniss married and had children in the epilogue. However it was a very depressing end as many died such as Prim, Finnick and her other close friends. Even though it was an amazing book I wished there could have been a happier ending after all that's happened to them but this was probably a more realistic end.