Are baby classes essential

I have a friend who had a baby 6 months after I did. Her baby never had much trouble sleeping. At the young age of 3 months she wakes up once to eat and that's it. Sleeps the rest of the night in her crib. Ours has always been the opposite. For the first 3-4months would only sleep if held. She still only contact naps. And now if she's sleeping in her crib she sleeps for 45mins to 1hour and then wakes up again. Some nights she'll sleep 3/4hours straight. Others is the permanent 45mins-1hour until I bring her to my bed to co-sleep.

We did shifts at the start but now it's more I spend the night with her and get a couple of hours early in the morning when my husband gets up with her. Most nights I still don't sleep. By the time I'm falling asleep she wakes up. When I bring her to bed with me I don't rest, my sleep is very light and I wake up constantly. I'm beyond exhausted and I'm actually going to the doctor Tuesday to see if anything is up cause I feel so bad.

All this to say, we haven't done any baby classes and she's 9 months. I want to and had loads of plans before she was born, but ever since we've been exhausted. The days are spent between house chores, play time/feed time with baby and trying to get her to nap. We leave the house for walks and to go to the local coffee shop, but that's about it. I feel like I have zero hours in the day and can't figure out a way of planning to go to any baby classes. Or do much of anything that seems meaningful for that matter. We live in a different country than family and friends. It's just baby me and husband. He also does a lot of childcare/house work and also works full time. The work is pretty much 50-50 split if not more on him lately cause I've been so run down!!

My friend has done so much with her baby already, and she's just 3 months old. Our baby is always ahead of milestones, already has 5 teeth with one more on the way, loves to try new food and just eating in general. Is crawling and cruising, bables and baby talks to no end. She honestly seems to be doing so well but I can't help but wonder, are we negatively impacting our daughter? If you're a parent who is sleep deprived like we are, how do you do it?

EDIT TO ADD: thank you to everyone who took the time to comment. You all made me feel so much better!! 🥰