Replying to I want to drop out of uni. advice?

ok, so im in a real hole right now... im in my first year of uni, and have just finished the first half of the first semester. so i have just started, and i hate it! im under heeps of stress with test and things for a subject im truely not enjoying... Im doing a bcom in managment/marketing, somthing i took because i want to run a business in the ski industry one day. At the moment im in the industry doing part time repping and work for a company, which is what i realy want to do! but this commerce degree is nothing like what im interested in, learning about accounting and shit is horrible and i cant stand it. i see myself as a bright kid, i have good ideas for improved business, and particularly in the ski world i know whats up, somthing i have learnt over the past 3 years working in it. but at uni, with exams and things like that, my brain just doesnt get the thoery side of it, and i cant do it!
This is where i need to make a decision, if i stay, work hard and grunt out 3 years of this course, even though i hate it, i will come out with a degree which will set me up later down the track if i change my mind with what i want to do. but the cons of this, i dont know if i can mentally handle that, i have been emotionally unstable in the past, and i dont want this stress to tip me over.
If i leave, i can gain 3 years of experience in the industry, learning about business that way, practically, understanding it, and enjoying it..... but the cons of this, i dont have a degree! but how much does that matter? i just dont know what to do... please just tell me what youd do or somthing!

sparknotes, im in my 1st year uni, i hate it, dont want to be there and want to leave to continue working in the ski industry... but cant way up the pros and cons of this! help