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To be nurse is totally different from being a Doctor. The length of training and schooling are very different. Nursing degree I believe can be attained in 4 years where as to be a doctor you need to finish undergrad then medical school then residency. So spend some time with this and see which area interests you more.
You might want to consider a degree related to biomedical sciences. I do know that at my undergraduate school the requirements for nursing and medical schools were quite different, so you may also want to do some job shadowing in each profession to see which one really suits you best. Since you're in your first year, you shouldn't have to choose a major for a little while, but I would recommend scheduling basic science courses for next year (if you aren't taking them already) since it sounds like a medical-related career is something you're interested in. You may also want to shadow some physician assistants (PA). PA's do not go to school as long as physicians, but they are able to see patients and prescribe medications much like doctors do. Nurse Practitioners (NP) are also very similar to PA's, but they are individuals who completed nursing school then got a masters degree to become an NP. There are many other interesting medical jobs besides these, so maybe do some research into different career to decide what suits you best.
Hope this helps!