What glitterbag actually means, though they seem unable to express themselves properly, is because then you can concentrate on study. As in the world of middle class aspiring plebeian people
, that is a good thing.
You are 17 year old, going on 12 year old it appears. I blame the parents.
Now don't be fooled we are an intellectual/academic family, my wife and our two adult children are all PhD's. However we also have a life and our son went and fought combat tours in a war at 19/21 yr old before he went to university. Because education is of no use without life experience, the wider and more varied the better.
When my wife gained her PhD the university instantly offered her a well paid job as part of a research team ... In other words a glorified administration assistant. She asked me should she take it? No. Open your own business, a consultancy. Another person who gained their PhD at the same time took the job and all these years on is now asst team leader. Wow.
My wife runs her consultancy, which advices the establishment figures in many countries, politico's, companies and governments .... No matter ones level of education 'the job' is usually a bad move ... BUT you have to have life experience. It would seem your parents and her father are not so keen on that.
Next, you have a strange view of 'love'. If you actually loved the girl then wild horses would not stop you from being with her ... So you're at best infatuated but most probably missing the sex.
Take some advice:
1) Make your own choices ... Not what anyone else wants; what you want.
2) Always make the hard decision, because it is the correct one invariably
3) Only life's losers seek immediate gratification
4) Be a person of your word ... if you say it then mean it ... Always do precisely what you said you would do, when you said you would do it.
5) Accept NO excuses from yourself. There is no excuse no matter what.
If you actually want this girl in your life, rather than you being merely tired of wanking off ... Then go and see her father: explain who you are, the respect you have for his daughter and him.. Tell him you want to be with her.
Be an adult, not a child.