Various internet sources claim 2 teaspoons is average per ejaculation. While that feels like a lot to a guy it makes a very small puddle.

According to a huge number of porn pics and gifs the average is a very large puddle. It seems the porn industry makes artificial jizz with egg white and such. In a dick side view they can hide a hose on the other side to pump out an exagerated stream. In full dick tip pics the flow is much less(normal). 

So: Don't believe everything you see. Much of it isn't real. Don't compare yourself to porn.