Is becoming a doctor worth it

Unless you're in the UK, you'll need an undergrad degree before you pursue medicine.
Pick something you like that you KNOW you'll do well in. You need an outstanding undergrad GPA to get accepted into medical school. Pick an undergraduate degree you can use for a career if you don't decide to pursue medicine after all.
You can teach as a doctor. You're constantly teaching. If you want to teach in a classroom setting, become a clinical educator or a professor. There is nothing stopping you from doing that.
There is also registered nursing if you like medicine and ethics but don't want to be in school for a million years. A baccalaureate degree in nursing in usually 4-5 years long. You can be a clinical nurse educator, nurse researcher, or professor of nursing if you like teaching avenues.
You can use a degree in nursing to get into medical school. Why not try that route? If you don't want to do medicine you'll still have a great medical career as a nurse. They pay is amazing (in Canada at least) and you pretty well set your own hours. It is more than old people and poop, so research nursing specialties and see if one suits your fancy. There are emergency nurses, ICU nurses, nurse anesthetists, etc. if emergency care is your cup of tea.
A common misconception is that nurses are 'useless' or 'subservient' to doctors. This is not at all the case. RNs have a huge responsibility and, if specialized, can practice independently. If you like the independence of being a doctor but don't want the years of medical school, become a nurse practitioner. Your scope of practice will be narrower than that of a doctor, but a lot wider than that of your average nurse. You can run your own clinic, prescribe certain medications, etc.
I started medical school and decided that it wasn't for me. I didn't want to be on call every Christmas, birthday, or anniversary. I didn't want to be in school until I was almost 40. I didn't want to spend several hundred thousand on my education. I withdrew, took a year off, and then enrolled in nursing school. It was far more rewarding (for me, anyway), and I know that if I ever decide to go back to school my grades are good enough that I could get back into medicine. As a 24 year old new grad, I was making over $86,000 for my STARTING salary. It isn't all about the money, but it's certainly a deciding factor.
I'm around my family, I was able to have kids at a young age, I am able to travel the world as a nurse (there are Travel Nurse jobs available where you're literally paid to travel the world), and I get to enjoy my holidays and family time. I don't regret this career move in the least.