Out of place

Sometimes I feel like I don't fit in with my roommates. They are always going out without me or they ask me and i go but I soon realize they just asked me go be nice and didnt actually want me to go, so they make weird small talk or ignore me all together. Whenever I message the group chat trying to make plans they ignore me but when someone else makes them they all answer. I feel the same way with my friends. They are always together going out to eat. Even when it's the 3 of us I'm out of place and I try to get into conversations but they ignore me. I know I'm probably sounding like a baby but please don't be rude. I just want to know what to do and if I'm over reacting because I've been seeing it more and more.