I was first aware of it in 2009. Forgot completely. Became dimly aware again in 2011. Did nothing. Got rolling properly in mid 2013. I feverishly read up on it for a couple of weeks. Looked up Gox, thought 'this is the NASDAQ of Bitcoin? Fuck that' and went to localbitcoins.
Almost all of the 'opportunities' and businesses looked like blatant scams to me and time proved it to be correct. I've learnt vast amounts of new stuff along the way.
I also recently know bitcoin on the times it price or value make a name in the market. But the first thing in know and I do to bitcoin when I used it , is mainly on gambling where I have a part of bitcoin in playing games in related with bet games. But when the time I seek more information about the system, transaction and the value of bitcoin I much learned more about its function in the economy and in my life personally. I used the bitcointalk forum as a platform in which I became more awre and knowledgeable about the real meaning of bitcoin in terms of transaction, investments and trading.