Key PointsOver half of Americans think financial security in retirement is out of reach.If you feel like you can't save for retirement, you still need to get started.Setting a goal and automating some investing could be a good first step. The $23,760 Social Security bonus most retirees completely overlook › If you feel like saving for retirement is impossible, you're not alone. An estimated 55% of Americans are worried they won't be able to achi…