Hate my boobs

Hi ladies,

I'm really struggling with my body image lately and one specific area that I've always been embarrassed about are my breasts. I have a D cup and they sort of sag and fall to the sides when I lay down. I know this is probably normal but I'm only 21 yrs old and hate the way it looks. I am always too self conscious to take my shirt off in front of guys bc of this. Any advice on how to overcome this? Also is this a normal thing that happens with boobs this size?

Thanks!