No one can live like that. I was told people should be careful about saying things like, I'm afraid he's not in, she was dead excited.
Gosh? Golly? I don't regard these as swear words. I associate golly and gosh with Christian (High School) Academy.
About swearing ... I used to swear every other word. I don't use swear words in general conversation anymore, but when I'm angry, I let out a few swear words. When I do, they are a lot stronger than heck, gee or darn.