when you love someone but you dunno wat you should do.....

can someone tell me wat should i do? i think i have a crush on a guy but i dun really know wat to do about it. everyday i will feel happy and also sad coz once i think about him i really wat i should do. i don really dare to tell him my true feelings about him coz i think he doesn't like me. i dunno when this occur on me.i'm really confuse and dunno wat to do. however, since i'm having PMR this year i can't keep this problem bugging me everytime. its juz that sometimes when i'm feeling lonely. i will think about him. am i stupid and not enough courage? i think i am. sometimes i always think why i don dare to tell him the truth but i think i'm juz a bit too young for that. furthermore, my parents 100% won't agree me to have a crush on someone. so this is a secret to them. i hope those who read this please keep it as a secret. i think this is my love life. how about yours?