My Body is Rejecting My New Hobby

I just have one question. One teensy, weensy question.

Why can people twice my size run twice the distance I can, twice as frequently, and NEVER GET HURT??? Are they superhuman? Can their muscles and joints, which are identical in structure and function to mine, sustain superhuman forces moreso than mine? How is this fair??

I swear, I am just floored that I am the only one on my team experiencing all sorts of injuries. It started with IT Band Syndrome. Then -- shocker --- runner's knee. A million dollars in physical therapy later, the hip flexor pain appeared. Yes, you can run through all of them, but the pain and potential for crippling aren't worth it. So you spend more money in physical therapy. Make sure the shoes are proper fit. Rotate the schedule to make sure you aren't stressing your body out too much.
And then.....the flippin' Achilles starts in. Seriously, I'm RUNNING OUT OF BODY PARTS HERE!!! I started feeling a little "pull" in the Achilles while climbing up those wrotten hills in the Las Vegas race. It was part of the reason I ended up walking the hill. You see, my Dad ruptured his Achilles fifteen years ago, and he's not been the same since. It was almost debilitating, so any tweak in that region freaks me out. Anyway, I had a fabulous bike ride last Monday, where I sustained the big ring for over an hour on some gnarly hills. I attacked those mofos! But then I felt tight in the Achilles again, which turned to soreness, and I stupidly ran on it Wednesday night and then on Sunday morning. Brilliant me. So I sit here now, happily in high heels (only pulls when it's flat), and waiting for my PT session on Thursday where we will yet again focus on a new body part. This time around, I am prepared to drop money on a bike fitting AND orthotics. Anything that'll help the cause.

I have to say, all these pings and pangs really get me down. So many people can follow the plans without any injuries at all. So why me?? I'm not overexerting. I'm not underexerting. I'm not exceeding distances. The plan is far from challenging at this point. Why why why why why why why????

Just to spite my Achilles, I intend to race on it next Saturday. I am signing up for the Sprint, which I will race by myself with the hopes of just adding a race under my belt. (And reintroducing some speed) I am not afraid about the race, but somehow I am freaking out about this Wikipedia article I just read about the dam and Lake we are swimming in. Apparently it is structurally unsound for a 7.5 magnitude earthquake, and the lake is 1.5 miles from the San Jacinto fault, which is more than capable of predicting one. In light of all the small earthquakes popping up in the US these past few weeks, I can't help but freak out a little about it. I mean, I guess if it's your time, it's your time, but I'll be damned if it happens to me in a free sprint triathlon I'm doing by myself.

I suppose I'm done bitching now. Hopefully the coffee machine salesman has vacated the kitchen so I can get my 2nd cup of heaven in peace.