Life In 19x19

Thanks for the super fast reactions! This is great advice man! I never thought of this! I will try to apply this new advice, I really appreciate your help!

Hello,

I just started go and did play some games against the computer on 9x9. I am having trouble taking territory against strong players, here is a game of me against a 15k player:
http://files.gokgs.com/games/2016/3/23/kl-Koridai-2.sgf

I can't understand how he could take so much, couldn't ...