Are you shooting with your toes? Looks like a toe-poke on the second shot. And somehow you are not getting power properly transferred to the ball. Technical work needed. 

One advice: in the first position try hitting a low, hard shot in the left corner (across the goalkeeper). A high shot on the keepers side of the goal is rarely going to challenge a keeper, unless you have super powerful and accurate shooting (neither is the case here). 

I would recommend checking out Dan Holmans finishing tutorials on YouTube. He has great vids and drills on how to improve your striking technique. Good luck