Every one of us who mountain bikes has a first story!
Don't worry, it will get better. You have no idea how many stories I hear from ladies where their DO or hubby takes them out on a ride and it usually is too hard for their first time. Almost everyone I know that got taken out by a man/boy/guy the first time has the same type of story! The guys never think the trails are very hard, BUT, they usually are for your first time. It's not that they don't like us, they just don't get it!
So, like I said don't worry. You will be fine! If you need to walk, walk. Don't feel bad. Slowly but surely you will get the feeling that you can ride it and then you will. Challenge yourself a little each time. Have fun, keep loose, and look way ahead of yourself don't look down right in front of your wheel and whatever you do don't look at the thing you don't want to hit! If you look at it, you WILL hit it!
spoke