Many folks may say "to help people" which is a very noble cause. However, I recommend to shadow a doctor you may know. While shadowing, ask them questions that help you answer your own questions. Coming out of that experience, your pursuit may be validated. On the other hand, it may guide you in other areas you never considered.
Now, there is absolutely a lot of dedication, patience and drive required into becoming a doctor. But, rewards will pay off if you're truly passionate in becoming one.
Best of luck!
Kal recommends the following next steps: