Mutluluk, galiba mutsuzluğa alışma hali. Bizi mutsuz edecek birileri çıkacak; sen ne yaparsan yap buna engel olamayacaksın.

My try:

Hapiness is probably getting used to unhapiness. People who make us unhappy will go away. Whatever you do you wil not be able to stop that. 

Hapiness is probably getting used to unhapiness. There will be people who make us unhappy. Whatever you do you wil not be able to stop that. 

Harikasın, çok teşekkürler!