Nice assumption of me being Christian.
The cross symbolizes the sacrifice. Nobody celebrates his death, it is only the fact that he saved humanity with his sacrifice that gets celebrated, and the cross symbolizes this sacrifice.
The cross is a constant reminder of what Jesus went through to save you. The only feeling it is meant to evoke is thankfulness to Jesus and a reminder of how much suffering he saved you from.
I'm just trying to explain what christians believe, because it is getting misrepresented here, causing distorted views on christianity.