Primarily, it's because one people has waaay too much time on their peoples' hands, and becomes obsessed with another people due to some perceived shared interest. Perhaps it's a surreptitious wink, a nod of the head, or a T-shirt with the name of one peoples' "favorite band." The "crush" between People A and People B can take three courses:
The solution is to realize there are about 500 million other people in the world, easy, that would fit one peoples' target demographic. Or, people can just wait till high school is over, at which point the urge to have "crushes" on people should abate, unless people is some kind of sasquatch or sociopathic man-child.
if your crush knows you like them AND they like you back then you can gradually talk about dating them. if they have said they dont like you back then dont bring it up again
by being beutiful
If they like you back
well you find a crush by looking everywhere start at school, neighborhood etc. find people who is like you the most and people who you like there you go you have a crush
yes
Because she's shy, she might be embarrased about the situation and just wants to get the people that know about her crush to stop paying attention to her by making it look like she doesn't really have a crush.
a crush
Find someone new
It's conversation. People like to tell things to their friends.
People have a crush on some one if they like them or love them. Your out come of having a crush is that you enjoy your life with that person and have a baby or babies. Some people don't want a family and that is up to you.
If your crush used to like you, you can show him that you care for him and he will start liking you again.
If your crush knows you love her even though she doesn't like you there is not a way to make her love you back. Love is something that naturally happens between two people. If it is meant to be it will be.