What they all said...
Don't pay up front. Do a few more (say 3 minimum) and then see how you feel. You will know by then. The first lesson is always tough - mostly its simply sensory overload.
If you want to continue, then try to fly fairly often, every week if finances will allow. But still don't pay up front.
Make sure you work at enjoying the whole experience of learning to fly. Immerse yourself in the theory. Hang around the school/club before and after your lessons. Watch, listen, ask questions. Everybody else there started just like you.
If you don't wish to continue at any point, then don't. Its not compulsory. Move onto your next "thing".