Well, for one, I don't feel like you "hate" these people. You may end up disliking them, but hate is a very strong feeling and by reading your post I do not feel like you really hate anyone. I think that's being a bit too hard on yourself. You seem like a pretty good person with a very strong motivational drive. That leads me to believe you can definitely get over these problems you are having.
I'm not sure what the issue really is. As far as relationships goes it seems like you get bored with the relationship, with the person in the relationship. I can relate to that. I'll be in a relationship and really care for the person and one day I just don't like them anymore. I have no emotional connection with them and I am just bored with it. This leads to a lot of detachment and eventually breakups. That may be something similar to your situation or perhaps not, I am not really sure.
Now, as far as bipolar goes, I can't really say if you have symptoms of it or not. I've only read one thing from you and obviously I have never been around you so I don't know how you get. I don't know how you get when you are "hating". Hate means different things to different people. For all I know you might get really mad and want to physically harm the person, but judging from your post that's not the case. I don't think you are crazy or anything like that, if you were I don't think you would be able to keep a steady job and if you really did hate I think that too would cause you to lose your job.
So the first thing you need to do is to not beat yourself up over this. There's a lot of weird mental issues we all have and some of them are very common and some of them aren't as common. We can't help how we feel though. My first thought would be if there's any particular tragic event that has caused you to be this way. Also, when is the first time you can remember first having these feelings? If you could think about that for a moment and figure it out it might be able to help you find the trigger for this. To find out what caused this feeling to begin with, because I do think SOMETHING has caused it. That's the first thing you need to do. Tell yourself there isn't anything wrong with you that no one else has, and don't beat yourself up over it. Don't tell yourself you hate these people, or everyone, tell yourself you just don't like the things they do. That's the first step.
I'm not a psychiatrist and I can't tell you if you need to go see one or not. Yes you have been to them before, but it appears you have good money so you really should try to find one that specializes in what you're dealing with. I don't think going to some ordinary psychiatrist is going to help. I would read up on the symptoms you have, find someone who specializes in it, and go see them. They can help you a lot more than I can. I think that some of the things you are going through are things you can one day control, and maybe you just need a shove of help to do so. Someone to help you through it and give you a head start so you aren't doing it all alone. I think in time you will get over what you're feeling right now, just keep posting here to us and let us know your progress. I have faith that you can get through it. Wish you the best of luck.