complacency?

So, I just saw my cumulative college GPA, & it's a 3.07. & I was excited about that. Then I thought about it, & a little over a year ago I was in high school, & I almost cried when my GPA fell below a 3.70. Well, I just got depressed because I feel like a totally bad student! Even though this year it seems like, if anything, I've put more effort and emotion into my school work, (I mean, I am paying for it out of my pocket!), I still come up short. Way short. I've just been trying to put grades out of my head and focus more on the fact that I tried my hardest, but then I feel like I'm being irresponsible or something. Shouldn't I just be trying harder? Surely this wasn't the best I could do. I wish there was some sort of happy ending to this, but this is really where I'm at right now. I'm just feeling kind of crappy about it. Hmm..that's all.