Well, you've had a funny year or two. For a start, there was that debacle a year ago where you thought it might be a good idea to cut your own fringe. Not to mention that dodgy hair colouring 'experiment', the pseudo-goth skirts and those charity shop horror frocks. Sometime this year, you will stand up to your mother and demand the right to spend a decent quantity of the money you earn on hair appointments and clothes. This will mark a turning point in your life.
Don't worry too much about your nose. I know you despair when you catch sight of it in the mirror. It turns out that it's true what people say, and teens just take some time to grow into their honkers. It will never be a wee button, but there will come a time when it doesn't stand out as much as (you think) it does now. On the other hand, I wish I could say the same about your teeth. Most things I can let you get away with, but I just can't be blase about this. You really need to wear that retainer.
I don't have that much advice for you. Keep an open mind, maybe. And ditch people who make you feel unhappy. I don't just mean boys (though you're pretty clueless about them right now, and bad news is, will stay that way for a while). You've a good heart but let yourself be taken advantage of. Watch out for the takers. Also, you take yourself too seriously a lot of the time. Lighten up. 90% of the stuff you worry about is just pointless. You can be a bit stuck up, though I know it's just because you're secretly afraid everyone is better than you. Thankfully, you'll get over this in years to come and live back down on the earth!! And another thing - I know you're not quite there yet, but believe me, school exams will not define the rest of your life. Nor, come to think of it, will your university results. So don't be a slave to the books (or even worse, a slave to worrying about not hitting the books). Oh yeah, and LEARN TO DRIVE!! Mum's told you that she's not going to insure you on the car, so you can't see the point, but believe me, it's a LIFE SKILL.
Daddy will never really get better. You will bear that burden for a long time. Watching someone you love so much fall so far so fast is a hard thing, and something you're just about starting to understand and make sense of right now. Don't allow it to make you fearful of your own life.. there's nothing you can do about it. It is what it is. Things will happen to people you care about that are just beyond your imagining, though I'm glad of that for now. You'll cope with things that terrify you, and often with good humour and grace.
On the plus side, one day your prince will come. You will wear the white dress (and the veil 
but only because your mother wants you to 
). You'll find a job that fascinates you. You'll be pretty decent at it, too (though you might want to start learning some organisational skills when it comes to paper/files because it will turn out to be something that plagues you). You'll buy a house. You'll keep many of the friends you have now and make many, many more. You will be blessed with the most gorgeous bouncing baby boy who will be able to make your heart just sing just by making noise or throwing you a look. Life will be good.
Enjoy.. there are some good years ahead. You won't regret it, I promise. Apart from not learning to drive.