A Top Rope fall - you will barely move in a top rope fall. Your belayer shouldn't have given you much slack with the rope and should have you fairly tight, if you let go of the rope, barely anything will happen. However you should still remember to bend you knees and try to kick off the wall, rather than face planting it and bruising all your limbs.
A Lead fall - A lead fall is slightly different, if you fall whilst lead climbing, you fall to where you last clipped. So the closer to the clip you last quickdrawed into, the less you will fall. To keep your fall as safe as possible, make sure you don't back clip on the way up, try to warn your belayer if you have time,
Everything will be fine if you have a belayer you can trust.
But I'm not going to tell you it's not scary. It is scary. You might scream. You're okay. You'll be fine. But definitely wear a helmet if you outside.