How much does the bike really matter?

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Wow, thanks for all the quick replies (and compliments!).

It sounds like my first step should be to evaluate whether my current bike will still be able to fit me. It felt pretty big when I first got it, but by last summer, it felt perfect. After my bike fit, they cut my stem down a ton. They also tipped my saddle back a little to alleviate numbness in my hands, but I noticed some soft-tissue pain after that. I was told that it was pretty much a trade-off between the two problems, which makes sense, I guess.

I've mostly just ignored the occasional soreness, but now, with my growth spurt, it feels really awkward to be on my bike. Both of my achilles tendons have been bothering me, and I've noticed some new knee pain as well. I'm not sure if my torso has gotten longer, but I know that my legs have for sure; all of my long pants are 2-3" too short now.

I did buy new tires today, so I am excited about that and hoping it will help a little! My team has a deal with Neuvation, so I could probably get new wheels through there. I haven't noticed a problem with my components (all Shimano Sora), so I think I'll stick with them?