Jobs/master's courses for math grads

How do I end up not being a school teacher?

Get your PhD, write a fucking brilliant dissertation, and get a job doing research for the government or the IAS or something.

Never leave grad school.

lol

Learn welding; I hear that it's great.

You can become an hero. I will do this too when my second grade will be complete.

>>1
You can't.  Because math is useless, unless it is "applied" math.

As in anything, really. Check out what kind of industry contacts your school has, network, and keep an eye what your friends who graduated before you become. There's need for mathematician in surprising places, but they're not very visible.
Some experience with statistics, physics, geophysics, cryptography or anything else gives you considerably more options, of course.