Crushing on someone

It's unavoidable to like someone, it starts anytime at any age but the most common time you feel it is during your early teens. What would you do for someone you like/love? Will you change your personality? Will you kill someone? Will you kill yourself if you found out that person thought of you as a friend and or worst, liked someone else? It's hard to crush on someone because sometimes you cant actually tell them straight in their face that you like them, you are scared that they may friend zone you. Over time preference change and crushes change, you might like someone else and they might like someone else. Sometimes there are people who crush on people for a very long time. I've crushed on this guy for 3 years straight and I don't even have the courage to tell him how I feel in fear of rejection. You can relate right? It's unavoidable, you get the mixed signs and you get confused and wonder if they feel the same way. You become happy when you find out you had the same interests, you are happy seeing them even from a far, you get touchy over the smallest things for example a simple smile or even seeing them wearing the same colored shirt as you. You feel like you are going to melt when you see them at your presence. It's normal, sometimes they may not notice you but they would eventually.