Is this normal or should I work on this?

I am 19 weeks along and a first time mother. I am increasingly feeling oddly possessive of my baby and she isn’t even here yet. I only want my partner touching my belly or talking to her. When my mom does it I feel really awkward and wish she wouldn’t. I always thought I would want my mom involved and I am finding I don’t really want anyone involved but my partner. Friends are calling me talking about giving me the baby stuff they no longer use and I really appreciate it. But there is also this nagging that it’s not what We picked for Our baby. When people try to touch my belly I have to stop myself from physically slapping their hand away. I’ve never liked being touched or the center of attention and it has only increased being pregnant. My partner and I both come from abusive family situations and I just don’t feel like I trust anyone but him or me with her wellbeing. Is this normal? or am I over reacting?