I am number one, Who am I?

So after much pondering I think I figured this riddle out, but it's completely wild and if it's wrong I'm going to look like a crazy conspiracy theorist. I feel like a guy putting red strings on a whiteboard here and I have no idea if I'm on the right tack or not. So bear with me.

Are you

Let me explain my reasoning here.

I can bench 200, 266, and even beyond 400 if I really try (it isn't advisable though).

200 MHz, 266 MHz and 400 MHz (abbreviated in computer science as 200/266/400) are common frequencies at which computer processor and memory chip clocks run - a.k.a. it's a way of expressing processor speeds. Pushing your processor beyond the limit it was designed for - that is, overclocking it past 400Mhz - is not advisable because it damages the hardware.

I'm pretty hot and tend to overheat, but that's just in my nature, in my skin. My family has the same issue too (so maybe it's genetic?)

Computer processors often run extremely hot, to the point where they become hot to the touch, and they can overheat if you run them too fast, i.e. when playing games or performing strenuous calculations. The whole family of computer processors that currently exist are prone to overheating, hence the line about "my family."

I'm an L2 language learner in Catalan, but I also know bits and pieces of Polish. You see, I'm a polyglot, and that's what I'm most proud of.

This is maybe a reference to the fact that computers "know" multiple languages, since being a polyglot is a word for knowing more than one language. Alternatively, it could be expressing that computers store data in many "languages," i.e. in binary.

I like my Mod pizza with Canadian bacon, Mozzarella, Olives, and Salami. Sounds delicious doesn't it? You'll need to be big like me though to handle it.

The first letters of Canadian bacon, Mozzarella, Olives and Salami spell CMOS, which stands for complementary metal–oxide–semiconductor and is used for constructing integrated circuit chips, a.k.a. computer chips and computer processors.

Most people consider me a slow, unfortunate soul. However, in my prime I was flying! Nobody could catch me. The sands of time have taken their toll...

When a computer chip is first introduced and/or manufactured, it is considered to be extremely fast, and often you'll describe your new processor as "flying" - but then gradually, with the advancement of technology and time, the processor becomes old and slow and new chips overtake it. Hence the "sands of time."

Working on what Sciborg said,

It's a shot in the dark, mainly because of.

Don't touch me too often, I've bitten off more than a few fingers.

I'm an L2 language learner in Catalan, but I also know bits and pieces of Polish. You see, I'm a polyglot, and that's what I'm most proud of.

I can bench 200, 266, and even beyond 400 if I really try (it isn't advisable though).

I am number one, and number two, and number three, but I will never reach A-level.