MIL help.

My SO comes from a very lovey, touchy feely family. He and his brothers are overly sensitive. Not like feminine, more like can't take criticism without it hurting them personally. Me and my sister in law (we married brothers) are both from a rough background. Broken, distant, harsh families. We don't hug. We don't share our life stories. We don't do touchy feely. The whole family has told us we're family now, which is totally great. We cope with the hugs. But on Father's Day, my FIL posted "I love all 5 of my kids!" He has three sons. My MIL calls me her daughter all the time, and does things for 'her girls' etc. I'm not trying to be ungrateful, but I'm independent. I survived this long because I did it alone. I don't NEED anyone else's help, but definitely don't mind my in laws being involved with the kids. Idk, I just feel like they take liberties with our relationship I don't even grant to my own parents. I'm not a 'get close to me' person. How do I deal with being so uncomfortable all the time?