The GP has put a "your" instead of "you're" in (almost) the very next sentence, so you don't even need to point to your own mistakes to illustrate your point...
Correctly so
> Your applying to those companies with 0 experience or college degree is unrealistic.
The clause "applying to..." is possessed by "your".
> You're applying to those companies with 0 experience or college degree, which is unrealistic.
</pedantry>
Edit: also looking back, GP used your correctly, so wut?