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Mine have been pointing out my entire life. My right one points out more than my left. It's really annoying. How do I fix it?

Well, more importantly, what causes it? How can I find out if it starts at my ankle or my hip?

Lance was hinting towards hamstring differences. He said to Nightfly he should do leg curls with feet pointed in different directions (inside or outside) to fix that.

Thats exactly right, in his case ^^ he would need to point the toes slightly in, leg curls holding a dumbell between the feet are great at fixing this because you inherently have to internally rotate the feet to hold onto it.  Reverse hypers with the legs perfectly straight are another good option as are sldl with toes pointed str8 ahead or slightly inward. 

Okay I guess I'll add in some machine leg curls with my toes touching each other (can only be done with toes pointing in). And yes, my hamstrings are DEFINITELY lagging behind, but even before they were lagging I've had this (like 12 years old even.

Another thing: how bout some stretches that will also help? Static stretching external rotators?

  Most of the time its either weak hamstrings or over powering glutes that cause the feet to externally rotate, either way the answer will still be the same, to strengthen the hamstrings into proportion.  Pnf stretching the external rotators is always a good idea imo, it likely wont stop your issue by itself but it will help your performance and make you feel much better.  The seated crossover stretch, with one leg bent, crossed over the other, and turning back around towards the bent leg, applying pressure with the opposite arm for the pnf cycles works very well.