I was worried about similar things.
However ignore these people. They're just projecting their own issues on to you.
I'll be honest the first week was hell for everything. Pressure for baby to gain weight, feeding issues. Hormones, birth recovery., tiredness. But you just cope. Seek support where you can and just trudge on through. I think your body is designed to counter act the tiredness post birth. I felt normal on about 3 hrs sleep. Which is far from normal for me!
After the first week things improved alot. I got a bit of a routine and balance. Still tough days but generally fine. I'm a routiney person. So for me getting up, showered and dressed every morning helped loads. Getting some daylight and keeping some normality.
Now things are great. I love it, honestly. Do i miss child free activities yep sometimes but now we get to do fun kid stuff like puddle splashing and farm trips and stuff. I had my time for dinners out, etc. Now i enjoy a family dinner out.
The saying the days are long but the years are short is very true. Before you know it your little one will be in childcare and you can enjoy some alone time or time with your partner. We actually plan an annual leave day every so often to do this, a whole day kid free is lovely. And before long your little one will be a big one and going to uni or leaving home. Your life isn't over its just changing.
Top tips.
-if you plan on breastfeeding have numbers of local lactation consultants and support groups to hand now. Including details on any private tounge tie service. The NHS offering for BF support is dire and private support will help. I find a lot of women who really want to beeastfeed end up feeling crap when its not working out and they're forced to give up.
-discuss how things are going to be now with your partner. We did this and it worked well. He took on all cooking, washing and cleaning for about 6 months. This included making me breakfast and lunch on days when i was stuck under a feeding baby. On occasion litterally feeding me. We also worked as a team. Even now bath and bedtime is a team effort.
-grab sleep when you can and prioritise your needs over others. If the house is dirty so what, nothing wrong with a nap.
-get a sling. A lifesaver with a clingy baby. Means you can do stuff and cuddle baby.
-ask for help when you need it. I rarely did this and i regret it. Thankfully my parents just did things without being asked which helped us hugely. But if you need sleep ask someone to take the baby for a walk. Dont ask dont get.
-dont put too much pressure on yourself. If all you achieve in a day is getting dressed thats still a win. Just go with the flow and take things as they come.