I'm finishing high school now, and have the impression that anyone who studies math beyond high school does so because they enjoy it. Occassionally, I manage to solve a math problem, and feel a deep joy and satisfaction. And so I try to read some math (undergrad) textbooks, but most of the time I feel frustrated with the tedium of learning some new theorems and concepts. Maybe I'm trying to read about proofs (Velleman), or attempting some of Spivak's problems, and after a while I get restless and feel like doing something else.
Is this normal? Is this frustration, boredom, and need for disciplined perseverance an intrinsic and essential part of learning math? Do things eventually fall into place, and that's where you get to see the beauty? Or is it supposed to come almost instinctively and every step is supposed to be a fun challenge, and I should consider trying something else that feels more natural?