Is this normal to have 83% of website visitors stay 0-30seconds?

[clearcrystal]

My website is still growing as I add new content, I get around 130 unique visitors a day (3000/month).
But most do not stay on the site. How normal is this and is there a normal statistic I should aim for say like 50% who stay 0-30secs?

There are about 300 pages a day that are viewed, so the ones who stay tend to look around a bit to read the articles. My site is http://askingangels.com

If the 83% I mentioned is a terrible stat, then should I play with redesigning the site to look more professional? Thanks for your help.
I also have a WP blog attached to the site which attracts a lot of bots - those bot statistics seems to be included, for example I have 500 views to my blog admin page in the last 10 days lol, those aren't my views, so a lot of the traffic must be bots