Hi, I'm sure this is just my anxiety, but sometimes when I lay down it feels as if there was something "back there" or like I'm laying on something....ever since I've been very anxious about it, I don't lay flat on my stomach anymore, etc....is this normal? Am I just feeling my chest wall or pectoral muscles? My breasts aren't very big and I'm thin, maybe it's my ribcage? Does this happen to anyone else? I'm only 23 and I noticed it years ago, so I'm sure it's nothing but it worries me from time to time and I obsess about it. Are the backs of our breasts supposed to be dense next to our chest wall? Does it feel weird to lie down for anyone else?