I know that you think you know what you want in life, but I can assure you that you don't... Not really anyway. Many people will come and go throughout your life, but don't forget to remember who has been there for you no matter what.
18 Year Old Me, don't be so trusting because you will only end up hurting yourself. You are going to encounter people who claim to care about you, but they really don't. You are also going to meet people who mean so much to you that they might as well be family. When people earn your trust, cherish their friendship with everything you have. I know that you will already do that, but you can't appreciate loved ones too much.
Don't forget that it doesn't matter what people think. You care too much about making other people happy over yourself. Sometimes you need to be selfish (and yes, I know I will be rolling my eyes at myself because I don't think I should). Don't jeopardize your values, beliefs, and happiness for others - if you do, you will only be miserable.
18 Year Old Me, before you travel literally half way across the world for something you think you want, please consider what you will be giving up. Think it over long and hard, because honestly right now I am wondering what the Hell I was thinking.
And finally, never stop working toward bettering yourself for you, not anyone else. I hope we find happiness and peace wherever our life may take us.
Thoughtfully,
23 Year Old Me