I'm a tall and lanky guy. Saying this, I have experience in both combat sports and archery. I feel I would be a good marksmen, so I would probably join a skirmisher regiment. Judging my heritage, I am polish, German, and English. So, depending on where I would be born, I would either be a jäger(East Prussian, preferably), a rifleman(95th preferably), or some sort of French chasseur or voltiguer(I honestly have no idea about polish troops, correct me if I am wrong)
Or, with my body type, a light cavalry man.
Edit: If it makes a difference, my family is in the high class. Possibly opens up officer positions?