I felt similar as I was preparing for the birth of my son so don't feel like you are alone in this feeling:)
What we did was have visitors in the hospital then after about 1 1/2 weeks we had one weekend day where we had everyone come over at different times...like an open house! We knew it would be tough to be social all day, but figured it would be easier to get it out of the way. Some people are just more social than others and having a baby is such an individual experience where some of us love to show off our new family member and others want to just take the time to be alone and adjust to the very big life change. Everyone seemed to understand our wishes. I was fortunate in that my partner felt the same way.
One thing I will share, as a fellow mama who loves her alone time, is that I was surprised how much I enjoyed having visitors during the 'open house'! Lots of attention was paid to my beautiful son, but it was also fun to talk about the experience of giving birth because no matter how much time to myself I thrive on, telling the story and laughing and all made me feel good.
Since the 'open house' we have had friends visit about once a week, sometimes every other week or we go meet them to get the little guy out of the house. We've had one person (the godmother) respond VERY poorly with lots of boundary issues and hurt feelings, but we have recently discussed this with her and she's backed off with profuse apologies. So expect some backlash, but also know that in the end, you are the mama and if people overstep, they will eventually recognize this if you are strong enough and compassionate enough to tell them in a kind but assertive manner.
Family is different than freinds, and me and my partner don't have family. He and I are fortunate in that we don't have to worry about grandparents over exerting themselves, but we are unfortunate in that we don't have to worry about grandparents over exerting themselves...if that makes sense. We truly are alone and there have been times when we've thought about what it must be like to have good families that offer support, even in the form of pre-made meals!!! Who knows, you might begin to feel connected to in-laws in a way you don't think is possible right now?!
You are the mama and have every right to limit social events during the first few months...you're little one may sleep more than you can even fathom at first as ours did! It was a big deal when our friends got to see our son open his eyes after several weeks (he slept a lot)! If you are clear with your boundaries and are considerate to not alienate your little one from the grandparents and extended family, people might not be happy about limited visits, but they'll just need to figure out how to deal with it because you will have a lifetime ahead of you for setting boundaries with others and your baby. The practice starts...NOW!
Figure out how much time you can tolerate after you've had a few weeks to adapt and just let others know you are blissfully enjoying your new role as mama and are taking this time to bond with your baby and work out a routine with your husband. If your husband wants more time with his family, maybe you can work out some times that aren't too much for you to bare and compromise a bit. Because eventually you will have to be more social as your baby grows to help in healthy development (positive social interactions are critical for developing minds).
But for the initial month or even couple of months, make sure you respect your process of adjustment and let your husband know that while you will do your best to be respectful of his family needing to spend time with the baby, you must take care of yourself during the recovery process and respect yourself enough to say 'no' when it feels like too much is being asked of you. Ask him to trust you are needing to take care of yourself during this time period and in return, you will trust he won't ask too much of you or will trust he will understand where you are coming from and will give you time to recover in your own way.
Sorry this is so long:) Congratulations and good luck! I think it will all work itself out and people will be more understanding than you realize right now! If not, oh well! You have a new focus now, your baby and happy new family, so be kind to yourself and try to enjoy this wonderful experience as much as you can...you earned it!