Scott - Don't kick yourself, and don't quit. You sound like you know the problem (poorly executed lab work) and therein lies the solution.
Note that I took Intro to Bio while working on my AA from the CC, before entering U of A. I did not apply myself and came close to failing. Cost me a stuffload of cash for the class, only to have to take it again at UA before I can graduate. That's the bad news. The good news is, I'll damned sure stay on top of it next time.
My intelligence is such that the majority of my courses end up boring me, and it takes little effort for me to succeed in them--especially given the crop of students I have to call peers. I learned quickly that busting my hump to be perfect (4.0) was a waste of effort as many of these courses are curved to hell and back. So, I've backed off my input, some, but didn't apply myself when I most needed to (BIOL) and it bit me.
Recognize your strengths. Accept them. Build on them. Recognize your weaknesses--Attack them! Stay after them. Be disciplined.
You can do this. Your age matters little. Be sure your major ends up being what you A) Want it to be and B) In some field that will allow you to take care of business once you are finished.
Don't give up. Accept that you can do this and "see" yourself graduating in the not-so-distant future.
I'm just now, nearly a senior, figuring out my path. I know where I'm headed now.
For the first few years, I had no clue. I talked the talk, but didn't believe any of it. Frankly, I could not envision my graduating with the 2-yr degree and was frankly somewhat shocked when it came time for me to graduate.
Now, I've accepted that I can and will finish my BA at the ripe old age of 44. In fact, I'm almost certainly going to minor as well, perhaps even double major (SPAN and LAST [Latin Am Studies]). The future is starting to take form.
Sorry if I'm being overbearing here. I do not mean to be.
Hang in there. Drop me a line if you want to discuss it further or pick my brain.
Well, had my final in inorganic today. Fairly sure I [beep] the [beep] [beep] out of it. A semester down the drain. Which translates to the last two years down the drain. Don't know what to think about that yet. Not sure where my life is going to go (at 41 - that seems pathetic to me), or what I'm going to do. But there you go. It is what it is.
The only up-side to this, is that I'm suddenly, in a flash of mental and emotional spasms, having a ton of ideas for photo projects. I need to write them down, 'cause I can't remember anything anymore. Hoping that I regain some motivation (here I come, hypomania) and start clearing off all kinds of projects. Serious photography is high on my list.
A work in progress. Starting next week (tomorrow I have to turn in a poorly-completed lab notebook, then the weekend is devoted to inlaws and lacrosse), I'll be spending some time trying to find my creativity again. And maybe some semblence of sanity.