Funnel

Kind of related to a different topic, but not. I was wondering if anyone else found polyurethane condoms to be extremely small. I bought a box of twelve once to try and every one of them i used, about six in all broke a little after i put it on. I don't think im that big or anything and magnums seem like they would be way too big, even though i've never tried one. Im about 7 1/2-8 inches maybe on a good day, but i have also had 20 out of about 300 or so condoms ive used break. Is that really abnormal? I got my gf on birth control because we didn't want to have to worry anymore. But that other topic got me thinking and just wondering if anyone could offer advice.