How many years of schooling (undergrad & med. School) you have to have?

Lots. Medical professions have one of the longest training periods. You had better be well trained before you go poking about in somebody's body :)

I assume you mean becoming a doctor. It takes many many years to become a doctor. I am going to be a Registered Nurse beginning with my Associates Degree, so far it has taken me 3 years and I have one left before I get that degree. Then my BSN will take me another 2 years, so that will be a total of 6. After that my Master's will take me about 2 1/2 years past that.

So, as you can see it takes a very long time to become a medical professional.

If you are in the U.S. and you mean becoming an M.D.:

4 years undergraduate and 4 years medical school and then an average of 3 years of Residency (different specialties have different residency lengths) before you can work on your own as an M.D.

But, there are different types of accelerated programs available (at least in the U.S.) that combines undergraduate and medical studies so that you may be able to get an M.D. in less than 8 years. Ask your guidance counselor or buy the MSAR (Medical School Admission Requirements) book for more detailed help.