i think most are scared because of one getting caught buying them (shop keeper telling mum/dad/sister etc)
or wont buy/wear them at all simply because of peer pressure (There m8(s) braggin how they have sex without a condom or they talk to there m8s about condoms and there m8(s) reply wat you want condoms 4? they r just a waste of time/money etc)

if you are worried about getting spotted why not visit your doctor/gp/family planning clinic as they can offer free convidencial advice and even provide you with the condoms for free.