Why I Won't Become A Sister

There's a funny thing about my name. My mother named me after a song, but Lisa is a form of Elisabeth, which means consecrated to God. Guess what my mother wanted me to be? A sister (commonly called a nun, though nun refers to cloistered, I think). I have no vocational. My mother and my grandfather both have tried to talk me into it, but I think it would be a mockery of something holy to go into that life without a calling. Someone at church said that I wouldn't know a calling unless it came on the phone, but that isn't true. It's rather mean and spiritually arrogant, but it isn't true.