This.With that in mind, there are tons upon tons of steam games that low end computers can play. Recettear, Rogue Legacy, Cave Story, Bastion, Bit.Trip, The Binding of Isaac, etc., all of which are great games. While I'd recommend getting a gaming computer, you still have a multitude of games to choose from if you don't have one.
But it won't be as fun if you just stuck to low end gaming. But it is your decision, ultimately, so just go ahead as you wish. Best option I recommend would just to save up for a gaming PC.