Definition of "Obsessesion"

went out for lunch with my guardian....than went to meet shiwen and janice and suwei at expo for MAss study...stayed there for a while than went to TM and just walk walk than went back to eat Bk with them...wats the definition of obssesion? can someone tell me that? explain what obsession means....y is it that no one can feel how i feel? i need a doctor, a person to explain why is everything going the opposite way i thought it would go, im not sick, but i want to talk to someone, someone that will sit down and listen to me and feels how i feel and can tell me what i should do and what has been planned in my life and whats happening next...someone...anyone....

from ashley parker angel-soundtrack to your life
There's questions, and answers
You'll never understand
I hold on, but let go
I give you room to breath
Remember, the best things
Will never mind to change