Don't be put off just because it all sounds daunting. Things like complex analysis, fluid dynamics, Galois Theory... it sounds scary, and some stuff is tough, but your course will take you from the absolute basics, step by step, until you can dominate that stuff. You'll be amazed at the concepts you'll be able to wield after a year or two. Of all Uni courses, maths is seen by other as being very dry, but is probably one of the most liberating subjects to embark upon. Last year I learned exactly how to show that there exist statements in arithmetic that are true yet are impossible to prove. It's as cool as it sounds, in my opinion anyway