Yep, that is how it is.
I nursed both my kids... that was how it was.
I nursed from both breasts, each session, and my kids drained both breasts, per session.
My kids grew like weeds.. and were big/long babies.
Don't compare yourself/your baby to hers.
You do what your baby needs.
Yes, nursing is arduous and constant, each hour rolling into the other. Normal.
She is a newborn... and they MUST be fed on-demand.
As she gets older, I"m talking older than 6 months old... it will get better.
A baby will also do what is called "cluster feeding" which means they even feed every.single.hour.. and need to, because they are growing so fast.
In an infant, a 'growth-spurt' is about every 3-weeks... and they feed more and more often at these junctures. So it will happen. And is normal.
My Husband, when I had my kids... would tell me "When I leave for work your'e breastfeeding and when I come home you're breastfeeding.. in that same chair. Is that what you do ALL day? " And I said YES. That is how it is... to have/feed a baby.
All the best,
Susan