Trust issues

Can someone relate or give me some advice please, so my son has turned 2 in October & ever since i gave birth to him i am super protective & I don't trust anyone taking care of him apart from me and my husband, my sister in law wanted to take him for a walk last week and I said No to her because to me I dont think she's any good with kids, she has 3 of her own which are teenagers but she doesn't seem to care about them, all shes bothered about is her boyfriend and I can't have my son around someone like that, also my mum when ever we go down to her house she doesn't seem interested in my son, shes always moaning that he's made a mess etc etc and i feel like I honestly hate everyone, im currently pregnant and some of my family members think ill loose interest in my eldest son once baby is here & all of the sudden everyone wants to help out but id rather struggle then ask anyone for help or have useless people helping me & people that i dont trust around my kids, am i being over protective or what because i dont seem to understand, everyone's moaning at me and complaining but i only trust my self with my kids and i cant help it