Why is it, that when i say i am going to be selling crafts for a living, people who are against it think i...?

it's probably just people that are concerned for your ability to make it and prosper. As a mother of a young adult daughter I understand the concern. As a fellow craft-er struggling to make a living I say go for your dream! If it doesn't work out at least you tried! What's that saying about if you never try anything- you'll never know what it's like to succeed? Just remember that in crafting- you can get sucked in to the "gotta make a bunch of stuff to sell this weekend", and get away from your love of crafting. When the love of it goes away- usually so does the beauty of your talent.