Why isn't suicide viable?

It is One SINGLE Life to Live. There is no another life for Us in this World.So, committing Suicide means We just lose Our life.It is better to live our life, without consideration of What others doing,or liking? It is Our life,We have to live for Our self,and If We like to do any Good cause for others We have to ready for doing that,without worrying about others doing.Is any body live for Good or Bad cause,It must Be Our wish for GOOD cause.