Talk about me

What am I doing here? Recently, I often think about it.
"Why did you decide this abroad? " I have been asked this question many times since I came here. I always reply, "Because I want to speak with many people from another country, and I want to go many another countries." It's true. I'm sure. But recently, I can't understand about myself. I don't know why. But I'm really worried about my future, and I think why I am here. It takes lots of money to study abroad, I know. And my parents are not rich. These are my father's money which he got by his hardworking. I don't want to waste his money. The day before yesterday, he said me, "You should go many places in UK, so if your friends invite you, you should go to any place." So, I decided to go to London yesterday. It was very nice. I really enjoyed the time, and I could talk many things with my friend in English. Is it correct that I take advantage of him more?
I have to study English more. That's all that I can do for my parents.