Откуда берутся суеверия?

I am trying not to believe in superstitions, as it looks strange for me to afraid 13 row in plane or black cat crossing the road behind you. But, anyway, it is impossible to except all the superstitions, as they are everywhere.

I try not follow any superstitions because thinking of what I should do if something happens and what it might be if I won't do it makes my life more complicated I suppose.

1)I reckon that i am lucky person because i get a kick out of living in the world.
2)Yes, i am quite superstitious person.
3)I know that people shouldn't kill spiders because it can give you mishaps or vice versa if you see butterfly, your day will be brilliant

I think that I am a lucky person. Yes. I believe in superstitions, but not always. I live in the flat N13 and everything is OK.