Why did my valve pin bend? Is there anything that I can do to help it without any specialized tools?
You have a Schrader valve. The pin on the valve core has been bent or the core is cross threaded in the stem - the picture is a little blurry.
You can remove the core by unscrewing it from the stem. There is a special tool for that, sometimes skinny needle nose pliers can be used.
Here are the options I can think of:

If the pin is bent or the threads on the valve core are ruined you'll need a new valve core. The shops I've worked at would replace it for you for free.
If the core is cross threaded you may be able to remove it and thread it back in straight.
If the threads inside the valve stem are ruined you'll need a new tube.

Hard to say what caused the damage but it's probably related to something getting cross wise during inflation. A bent valve core pin is unrelated to road types or number of miles.