I deeply regretted not pursuing Actuarial Studies a little bit after deciding I loved Commerce in late 2nd year / early 3rd year. Now I'm over it -- and happy with going ahead to finishing my degree (the Engineering part), and found other fields (entrepreneurship, marketing and communication, user experience and design) that I love that have distracted me from the attractive career path of Actuarial Studies.
Although even that anecdote about learning market regulation scares me from Actuarial, and makes me feel a bit better about not learning it. I stick with a pretty theoretical subset of Commerce (Economics and Finance). Accounting is more practical, and will delve into the yucky regulatory details.
(BTW, I heard with becoming an actuary that once you pass the exams -- I made that sound way easier than it is -- you're set! The hours aren't standard, not extreme, and you are paid a lot, but that's an aside)