I have 19 yo and i'm a first year CS student and I think I pick the wrong field(i like to code but not to sit in a chair for 8 hours / day my whole life, i think it's rly boring ), from high school I like biology and idk what to do, I would like to do master in molecular biology then PhD (in Europe) but idk if I can get in with CS background, so what should I do ? Continue with cs or start a new bachelor ?

Switch to biology or apply at a school that offers the degree you want. (Back in my day, we declared a major at the end of sophomore year and began taking classes in that major in junior year.)