Can't seem to keep any friendships

After I was diagnosed, I lost all my friendships. I try not telling people I'm bipolar, but then I have an episode and they end up finding out that something is wrong with me. My family doesn't support me at all. I just feel so lonely. I feel like people only want you around when you're at your best and well, I don't have money or a job or fancy stuff because bipolar took everything away from me. So that makes me way less interesting as a person. I have to turn down invitations because I don't have money at all, and I can't buy people stuff or get anything new. For those reasons I feel like I'm not even worthy of having friends, but it sucks feeling so lonely all the time.