Feeling wrong

I have grown up in this family since I was 1 years old my dad married my mom and we live very close with my mom's family my mom has been with me my entire life but for some reason I cannot help but feel like I'm in the wrong place whenever the family gets together in groups I always feel like I'm somewhere I shouldn't be like when you go to a new friend's house first time I never really feel like I click with anybody I'll get along with them and we'll laugh but I always feel like I'm somewhere I shouldn't be like I'm an imposter I love them I know they love me but I feel left out I used to feel this way with my brother but my brother has recently gotten very close with them so it's just me I feel like I'm a problem and I can't tell them I feel this way because I really don't know why they're not bad people it's nothing they did I just no I'm not close with them like my siblings are and I feel like I'm in the wrong place