How do you reach happiness?
You reach happiness by doing the things you love, and being around the people who you love. You can't be happy if you do things you don't like, and you can't be happy if you're always around negative people. Make sure you look for a future career in which you'd enjoy doing everyday, not something that pays a ton of money if that wouldn't make you happy. Also make sure to put yourself with people who are supportive of you, they will be the ones who will make you happy in the end.