Let me tell you something, No work experience in life is wasted. First of all do you like teaching? You may not have given this much thought, or simply may not know the answer yet.
Ask yourself a few questions
Do you like simplifying things for people/friends?
Do you have a knack of making hard to understand concepts easy to grasp?
If the answer to those two questions is yes, then the teacher is IN you. You might have unknowingly been helping a lot of your friends at school with subjects.
If you just want to take the post for the heck of it, or the money, forget it.