High Bounce Rate Problem

I was getting some traffic from Twitter, Facebook and Google but I had a problem. They were leaving straight away. It wasn't good for my Google ranking. I had a high bounce rate. Another thing was I didn't like the font of my theme nor did I like the small featured image that appeared at the top of my post.

I decide to change it and customize the theme but I couldn't find a way to change the font or get rid of the picture at the top of the post. I looked in the editor and saw they were using a font I had never heard of before.

Then I was playing around with the tablet and mobile view. Once I realized how bad my site looked on mobile I realized that people were visiting my website and thinking this looks bad and deciding to leave straight away.

If anyone has a high bounce rate it is worth looking at your website in theme customize and seeing if it looks presentable. If not this could be why, like me, you have a high bounce rate.