I bought a Trek Fast Track 420 off craigslist a while ago and been riding it. Everything was maintained pretty well but I want to ride a bike that was made 2012-2013 however I'm just a teen with no job therefore no means to pay for a $700+ entry lvl road bike. I was wondering if its possible to upgrade my Trek's current components piece by piece for example changing the wheels,fork, shifters (it has frame shifters), etc. And will that method be successful? Or should I just really save up?