Emotions

Why do emotions hit us at the most unwanted moments ? Just when you feel everything is going right and you are happy with life, poof, out crawl these emotions which no matter what, you just can't hide.
I thought i was happy with everything around me, i had finally succeeded in swatting away the negative emotions inside me. But no, out they crawled today, sneering at me, laughing at the thought of being free. Free to crawl out and make me feel blue. There are thoughts that cross my mind, sometimes once in a while, then they become more frequent and then they end up being all that i think of, all of the time. Thoughts like these do take over my mind once in a while. Where i feel completely lost, just fighting with time.
I sit here today, not knowing what i want to do in life. I have no list of things i want, nor things i don't. There was a time my life was so simple, i always knew what i wanted at that point of time and i followed those emotions and got it all. I made mistakes, i did have falls, but all the time, i was moving on. But today i sit and think, what do i want and i am as blank as a white wall. I am scared to start from scratch and learn something new, and at the same time i am not keen on continuing what i always believed i was meant to do.
All these years i knew at least some things would always be stable in my life, now suddenly i am doubting everything in my life. Why thoughts, why do you crawl out and trouble me so, i don't want to think along your lines, i want you to just let me go. Fly like the birds, free spirited and high, with no destination, no hurry to get anywhere on time.