We deal with this same fear by not needing. IRL we avoid people and don't need expect or want anything from anyone. We operate from an assumption of rejection. We are (usually) pleasant kind and compassionate towards others but we literally expect nothing in return. Not the 'oh, nobody will care for us' or 'nobody will think of our feelings' kind of thing, but a flat out expectation and acceptance of not being liked cared about or considered. We usually withdraw before the awkwardness can begin.
At the same time we have strong connections with and care for each other, so there is no loneliness. We have no expectation that anyone would like us at all. We are not likeable or lovable. Sometimes people might think we are but they are wrong. I guess all those feelings of rejection get avoided this way.