Are there any pills that control social anxiety

If so, how do they work? Cuz I'm pretty sure it's impossible to stop anxiety and that it's probably all in your head.

While there are anti-anxiety medications. Especially a social phobia, one shouldn't try to find a quick fix. Getting on prescribed drugs is like signing up for an addiction that could possibly be solved in a more organic and personal way.
Anyway, when people are anxious chemicals are sent through the brain, duch as adreniline. It simply takes the right chemical balance to counteract any natural forming chemicals in your brain.
Xanax and valium are Anti-anxiety, Inderal is a beta blocker.

No, some anxiety is caused by an imbalance of neurotransmitters serotonin and noradrenaline in the brain and the drugs try to restore the balance.

Someone i know is prescribed Atavin and when he starts to feel anxious he puts one under his tongue and it puts him at ease.
You can only get those prescribed by your doctor.