Why does it need to be a carbon frame? With the specifications you've given, you could get either a really rubbish liability of a bike for not too much money, or a professional quality racing bike. You need to be more specific- how much can you spend? Size? Events- you say tri, are they drafting or not? Hilly? Distance? Will this be just for racing, or will you train on it too?

Finally, you're only 15- have you reached your full height? If not, why spend all your parents money on a carbon bike you'll outgrow in a couple of years?

I suggest that you could get a really good alu bike, with clearance for mudguards so you can train on it through the winter, with tiagra or 105 components, and have money over for some clipon tribars for the non-drafting events you enter. Then in a couple years, when you know more about the type of events you'll be competing in, you can spend the big money on a bike specific to your races.