Breast feeding my 2 year old =getting old

I'm due today and #2 and I hope this won't ruin it for me. It's annoying when she latches. I love her and want to comfort her but sometimes I get mad and want to hurt her, the sucking frustrates me. So when I get mad I clap my hands as hard as I can together instead of hitting something or her. (I've only ever spanked her 4x, unrelated to nursing) it's not disapline I want to afflict on her, it's "get the fudge off me before I hurt you" kinda feeling. It's just because I've been doing it zooooooo long, and now I'm having a LO In a few days and I'm hoping it's going to be enjoyable. I didn't start falling this way with my toddler until I hit the 3rd trimester. Maybe it's hormones? Anyone else annoyed?