Is there something wrong with my lungs,chest,or heart?

for the past week or so Ive been feeling like I have to force every breath I take,like there's a heavy weight on my chest.I feel like Im not getting enough air and also,you know how when we breath,its involuntary?I'm starting to catch myself not breathing and having to start myself breathing and I have to continue to think about breathing so that I dont forget(if that makes any sense) I feel like its becoming voluntary and Im starting to become terrified of loosing my breath.I know that we all gotta die sometime,but I dont want it to be because of this.Can you please help me out?This is an emergency and I DONT have time for senseless idiots making fun of me