Hi, Jas,
To use the immortal phrase used by Norman Tebbit ( probably before you were born) 'Get on your bike'!
Get addresses of all your local practices ferom Yellow Pages, prepare a list of your reasons for wanting to be a VN, telphone or write to all your local practices asking for an appointment, dress properly, remove any visible 'body piercings' and go out and sell your self. Volunteer to go in and help for no pay at weekends and school holidays ( that mught either change your mind or confirm that you really do want to work with animals)
Make sure by contacting the Veterinary Nursing Dept., The Royal College of Veterinary Surgeons, 64 Horseferry Road, London SW1P 2AF that you are taking the right subjects at school to be able to satisfy their requirments.
Good luck!
W