Join when you still have the opportunity. Also, wait for the right one and don't waste 3 years of your life.

 Don't regret anything I did in the past. You learn from mistakes and thats what makes you a better person today

 You should've completed your studies. That feeling that anything was possible, was (and is) unrealistic.

 stop worrying about your weight and making yourself throw up. it will change your whole oulook on life and you will lose so much more than your weight.

 you are not perfect, you are not the smartest, funniest or prettiest person in the world. that is beyond your control. that is allright. because you can always be the happiest.

  Stop obsessing over him. You're still with him and everything, but focus more on school. You won't see him for four more years. And he's as great in bed as you thought ^_^

 Writing to yourself when you're older doesn't change anything. It's a huge waste of time and it kind of makes you look like an idiot. But it makes you feel better, so keep doing it.

 Everything happens for a reason. That doesn't mean there is a large plan tailor-made for you, micro-managing your whole life. Just open your eyes to the world around you. You will see it, and you will be happy.