So this might sound weird it's about breastfeeding

Ok so long story short, I have 2 boys at home they'll be almost 12 and 7 when baby brother comes in March. I've never breastfed before but I want to try this time. Will it be weird if my boys see my boob? Like if they walk pass the nursery and I have my,boob out? Of if I'm downstairs I don't want to have to use a cover in my own house but they've never seen my nipples or boobs and especially for my older boy should I try and cover them up? I don't know I just don't want to feel like I'm sexually abusing them in some way by having my,boob out. I know this sounds weird which is why I put it in CC. I'm kind of worried about it though