Hi jantecki19,
When first learning guitar, it can be uncomfortable. Make sure you hold the guitar with a relaxed grip, but also have the guitar's body up against your stomach.
[br]Also, what do you mean when you say you put on the bed? Are you playing the guitar as it's flat?
Make sure your back is straight and your wrist is not awkwardly angled. If you haven't alread, please take a look at our Guitar Fundamentals level 1 course where it shows you how to properly hold a guitar. check it out here: https://www.guitartricks.com/lesson.php?input=21987&s_id=1766
If you have any questions, comments, or concerns, please contact us.