I was sitting in an Italian translation class at university one day, when my teacher asked the bilingual students to raise their hands. Educated at Haut-Lac International Bilingual School as I was, I put my hand up. I spoke English and French at home in Switzerland and was studying Italian at university.
The teacher proceeded to say that true bilingualism is only achieved when one can do everything to the exact same level in both languages. Incorrect as his assumption was, it is only one of many untruths spread about bilingualism.