Oh, you replied! I must have missed it, I'm glad I checked the thread again.

Yes, that's different, but I can tell you that my experience with online friends has been the same. The fear of rejection and abandonment doesn't make its presence known to me until I'm fearing for my real-life friendships. I also don't have this fear with family members. I've also been very quick to remove people from my life if I have felt that it was necessary, and in retrospect I think it wasn't always the right decision.

Yes, if it seems normal then it probably is, I would think.

The need to isolate yourself is probably the depression. Not trying to say this is what I think you are, but a lot of people with depression actually have bipolar II or a lesser form. You mentioned some mood disturbances, but not a lot. People with bipolar II are usually much more depressed than anything else, and some rarely have hypomania at all. Still, don't expect it to be bipolar, I think it's a far shot. Just off the bat I can't think of any PD that I think you fit into, which is a good thing. You don't want that diagnosis.

It's normal to act a bit like a different person around different people, especially if you've been isolating yourself and just met people online. If you have troubles recognizing that you are, in fact, the same person across different situations even though you behave differently (i.e. you behave radically differently) then it's definitely an issue.

People are different. Some are more empathetic, others are more rational and can seem cold. Some people are empathetic but don't show it. It's all fine. If you feel totally different it could be a PD. Have you ruled out schizoid? You can rule out schizotypal, because you do want to see other people. Anger is a sign of depression, especially in men, but it is also a prominent feature of bipolar II. At this point I don't believe you have BPD, but you might have issues with some traits of BPD or other personality disorders.

I'd guess your main issue is depression. I'd also guess that it's not a bipolar depression, but it could be. You said you've been like this for a long time, so do you think you've been depressed for more than a couple of years? Have you been sort of blue and uninterested for many years, without being fully depressed? If you've been depressed for 2+ years it's a chronic depression, which means it could very well go away, but it's more serious and you should get treatment for it. If you've been blue and uninterested for many years you could have dysthymia, which is actually also a very serious disorder and you should sooner or later get help for that too. It is possible to have both unipolar/bipolar depression and dysthymia.

Hope this helps. Good luck!