I have not been willing to let out my feelings because it would make me feel bad but i just can not anymore

my problem is i don't like my stepkids sometimes  it's more like i have mixed feelings towards them.sometimes when they come over iam all smiles and tolerating them but sometimes i just resent them being in my house messing up my things and just being in my space,i have prayed about this and still i feel some sort of resentment towards them especially when i look at them i just see their mothers face i just get really angry