Replying to I need your opinion

I'm a 16 year old high school student, ive been taking art and graphic art classes. Ive always wanted to start my own business and recently i cant get this idea out of my head about starting a t-shirt company. i have everything figured out, and i mean everything. i know exactly what im going to need and i already have the money for a heat press, scanner/printer, ink, shirts, everything. i will be able to do t-shirts long sleeve shirts and hoodys, their all quality too. my art teacher and i have some pretty solid designs already and im in the process of getting them onto my computer. i know probly 90% of you guys reading this have thought about doing the same thing but im really about this. the whole reason im posting this though is to get your opinion because i know i can produce the shirts but i dont want to drop all this money, set up a website, and go broke. so do you guys think anyone would buy them?, ive talked to the dudes at my local skate/bike shop and they sounded siked but i dont want to do this if im only gonna sell 5 shirts to a couple friends of mine.
i'm a skier obviously (why else would i be on ns) but i also ride bmx, i also have alot of friends who skate. we always give eachother shit for wearing skate brands or bike brands, but i want this to be mutual. for skiers, skaters, bikers, even fruitbooters.

lemme know if you guys think if this is a good idea or a waste of money haha