Why not ask waterleaf mm? Her major is stat. My major is not stat though. But I think it is natural for you to encounter vocabulary issue as a beginner in health field. It is not that hard to catch up though. Even medical students spend a long time in memorizing those numbers and terms. It will be easy after you work in the field for a while and take some related biostat classes.

"系里的老师大部分都是做生物方面的，每年来系里要internship的全都是做药，做health research方面的公司"

this is a big issue. you need internship to find a job. so if you focus on finance/bank/investment, you may ended up a very hard route on internship/job hunting.