I just saw a simillar mention here
http://www.medhelp.org/posts/Mens-Health/Penis-and-Erection/show/1138549
I also left a comment there that might relieve you of any worries
Hi,
How old are you?
Are you taking any medications?
There is an average erection angle provided by some literature but these may vary through ages given certain factors like underlying diseases and psychological factors. This may not be something serious however, you may consult with your primary physician regarding this for a complete medical history and assessment.