安安静静一个人过用英文怎么说

live with myself peacefully

live lonely and quiet

live alone peacefully

lead a lonly and quiet life.
听楼主的意思应该是带点落寞的吧，那就这么说。如果强调内心的平静，平和的话，可以说
lead a peaceful life.
如果说有“简单”的意思的话，可以说simple

lonely, only myself

leave me alone