In my case I would change a lot, since now im depressed nerd sitting 24/7 at computer, my life is a complete joke. Probably most people would say like this:

"Its you're choice, u are the creator of your own life, world can change depends what u see, if u see yourself as a happy guy, u will be the one, if your mind is fucked up your life will be too"

-Its right. I can agree, but what if u can't control yourself? If u can't control your own mind? U want to do something but ur body won't. Its like you have handcuffs on you. Let's see u know you should go right, but u will still go left. You know the way to go but u still can't go there. How can we change then? How can we remove the handcuffs from our minds? I didn't found answer after 24 years of my life. I can just guess, that's why I think if I would have a warning that I am gonna die in 1 year or even my parents would die, maybe shock therapy would help? maybe I would change myself? I don't want my parents to die, I don't want to have only 1 year left to live, but I still think it would help. Maybe its the only way to change.

Thats the thing I would change:

• I would like to find love, that is the thing I am missing and I can't deal with it.
  -Besides it I would betray my love probably, I would love to fuck all the kind of girls, polish, japanease, korean, italian, swedish,latina etc...
  -I would steal some money. (let's be honest I have one year of live, do I really want to spend it on working? i guess not, money is not a guaranteed happiness, I am living already 6 years without any money sitting at my parents house, but to have a 1 year of succesful live I think money would be necessery)
  -I would use this money to go into steroid cycle and build the body I allways wanted, now when I look into the mirror I want to die. I can't look at myself, I am so ugly.
  -I would use this money to go and meet my internet friends, in my city I have no friends, so I would love to meet my internet friends. I really love them and I am sad that they live so far.
  -I would also use this money to take a trip to Japan as I love Japanease culture. Probably I would go and fuck some Japanease bitches, cause I love japanease girls.
  -I would do drugs probably, alcohol, weed, amphetamine and extasy. Who cares? I am dying anyway so let's have best year of my live.
  -I would stop sitting at PC 24/7.I would travel around world , I would go to all the band concerts I like and do crazy things like drugs,girls.

So it looks like I would change myself into worse person that I am now. To get the things that needs time to get, I would need to use bad methods like stealing,drugs,steroids, just to speed up the process I would need years to reach.