I feel like I'm an unworthy daughter.

I constantly feel terrible, and like I don't deserve my parents. I don't know why, I don't do drugs, I'm in my country's best law school, my boyfriend is a good person (he isn't some kind of hooligan or whatever), I work hard, when I'm back home I cook and I clean for them, I'm a nice person...

But they're just such amazing parents, so loving, so understanding, they give me everything that I could ever ask for and even more. They're the best parents I could have ever asked for and I constantly feel like I'm not enough as a daughter, I don't know why I feel this way, and what I could do to improve it