Below are 3 games in which I played as Black against "postneo", a 6k bot in the Australian Room on KGS. I the first game, I thought I was losing, but I won by 2.5 points. In the second, I lost a few groups and lost the game by 34.5 points. In the third, I really try and win the game by resignation. Much obliged in advance for your input.

As a general suggestion for the first game, when you attack you should have a goal in mind. Often a goal may be territory, or influence to do things later, but another goal is to attack as defense. That is, your aim in attacking is to use the attacking moves to stabilize your own groups. In the game, black attacked a lot, and often had a local success, but there would be cutting points left behind that could be exploited, etc. Black then proceeded on another attack, but without fixing the weaknesses from the previous engagement, which allowed white to turn the situations around. Consider trying to make sure you don't turn from the attacker into the attackee.