I can 100% relate - i’ll desperately want to become friends with people but i’m very introverted with people i dont know and then very chatty later on - people always apparently think i look tired and like i don’t want to talk to anyone when that’s really not the case
one thing that has helped me is literally just telling people that you don’t hate them youre just introverted or not a very high energy person - this doesn’t have to be some big serious declaration - i’ve found that if you bring it up in a light hearted manner it often leads to more open conversations
best of luck!!