I just blocked my mum on facebook.

I'm 23 years old grill; left home this September to study aboard for one semester. I'm very introverted person and feel the best when I can do things on my own (study, read, work out, etc). My parents are really bent on keeping in touch with me which means

>at least 1 hour of skyping with my father (sometimes mom joins him)
>at least 1 hour of messaging with my mom on facebook

My days are very alike, not much happens, and things that do happen are not suitable for a convo topic with parents (Mom, Dad! My friend sent me his dick pic today! Do you wanna see?). I really don't know what to say when they call me/message me besides that I'm fine, what I had for dinner and what book I'm currently reading. They talk about their work which fine, is interesting for first 20 minutes, but then just boring. I really have enough of that. I don't want to keep in touch with them. I understand some messages from time to time, but every effing day? Now my mum messaged me just to talk about my sister. I told her I'm not interested, I don't care about her at all and I'd rather not talk about her. But no, my mum started a tale elaborating on how my sister jammed her toilet. I have enough of this shit. Told my parents I don't see a reason why we should talk every day but they just ignore it. What do I do?