I'm a terrible mother

I have a nine week old son and I feel like I am the worst mom ever. When I get home from dropping his dad and two of his three older siblings off at school and work it's just he and I all day. When he's not being fussy and constantly gnawing on my nipples(he's breastfed) I often whisper to him that he's my favorite and honestly I don't even know if I mean he's my favorite child or just my favorite person to be around at the moment. When he's going through his fussy moments and his constant eating moments I feel completely worn out and want someone to just take him for a few hours because I'm overwhelmed. Two of my cousins lost their little boys and here I am being wishy washy with mine. What kind of mom am I? A terrible one. Smh.