Why do my parents disapprove of me so much?

Find some middle ground with mum. The few hours that you spend on Facebook is just sad. Maybe spend an hour to half and hour on it. Use the other parts to do the stuff you hate. Maybe do half hour a day and then you will be fine. Try and be a bit more respect-full though. I have a sister who is learning the hard way. If something has led to suicidal tendencies, then I would advise against doing it. Try talking through with your mum. In the end, you have to find that final balance. The ying and yang.