my sister is about to turn 15 and she says shes liked a boy in her school since year 7 basically , on and off , , shes quite pretty but does lack confidence and is literally always on a diet , always worried her shoulders look big or that she looks too tall (shes 5ft 3 ) anyway she is always going on about how much she likes him and how hes such a 'cutie' she really really likes him and she wants to have a boyfriend , he doesnt seem popular or intimidating at all from what she has said , any advice ?