Can I get to change my current lifestyle?

I wanna change my current lifestyle. I don't want to be like before this. I hope to change into someone can give comfortability to others and get others believes on me. I want to gain more friends than enemies but sometimes enemies are better than friends because only enemies will not gossip about you. Like what my previous tuition teacher always say "Don't listen to your friends. Friends are all liars." 

I want to become someone who holds on own principle. I don't want to argue or fight with my classmates. I will only do according lecturer's instructions. If they don't like it, I can't help it and they have to go and tell the lecturer themselves. 

Nevertheless, I want to become someone who is very good in studies. This semester and coming semesters and in university, I want to get great grades. I want to be 4 pointer student. I want to study in Korea!!! I want to be a singer/artist like what I always dream.