This is a standard medical school personal statement.
The main question to answer is “why medical school”, essentially.
In addition to, “Why have you selected the field of medicine?” it is good to discuss your motivation for medicine, things that inspired you, ways you explored the field, ways you have developed qualities to succeed in medicine, things you want a committee to know about you.
Discuss your motivation for medicine, things that inspired you, ways you explored the field and ways you have developed qualities to succeed in medicine.