Things I'm doing wrong

I have been playing some strong players lately and I hope to be able to fill the blog with good losses that help me learn what I'm doing wrong. In the game I will show here I have two chances to play good moves and blow it. So what was wrong with my thought processes on those moves?

1) I was too concerned with my position being perfect instead of having a position with good prospects and keeping my opponent from having counterplay.

2) During an attack I was concerned with a nonthreat while missing the real threat. Consequently I played a bad defensive move instead of building my attack.

Let's take a look at the game, situation (1) is at move 10 and situation (2) is at move 23.