I can understand how you feel. I've been lonely lately too, though your feelings sound much more severe than mine. When you say that you feel there is a force field between you and others, perhaps that is a sign to step outside of yourself for a while.

I think that taking an interest in others is key. Do you engage people about things that THEY are interested in, even if that topic doesn't interest you? Having a boring conversation isn't fun, sure, but very often a boring topic can turn into something interesting and also makes the other person feel valued as a whole person, and not just bits and pieces. Nobody is perfect, and nobody is completely like you, or will completely agree with you, so you need to be willing to accept parts of the person that are annoying, or boring, or ridiculous if you want to be their friend.

When you say that you get dismissed, could you elaborate on how that plays out?