To me, this is not failure. It is experience.
To me, you did well.
I see your effort, I see your hard work.
To me, you're greatest.
Being optimistic doesn't mean that you give up.
Give up stuffs that you like.
Being optimistic means you persist on even if you meet failures.
Its never easy to overcome all these.

Life is like roller coaster.
ride up ride up ride up..
and when you're not focus enough, you slide down a little.
a little more if you still remain stagnant.
but when the time is right.. you will pull yourself up and rush up to the tip...
and you will zoom rush down the exciting route...
but once you're at the bottom... its time to work towards the top again.
hahahah!~
So, is it time to work now?