I'm a liar right?

Hey everyone,

Thanks for taking the time to read this. I've been away for a while thinking about many things, but I wanted some advice and maybe some guidance for my question. I've read the topic about compulsive lying and I can relate to about 80% of the reasons for lying. Don't get me wrong I love lying and I can't help but feel better after I lie. The strange thing that I don't understand is that there are times when I love to tell the truth especially when saying it hurts someone.
I know this should probably go in a general thread, but my moods change like night and day. Sometimes I can't help but lie and get my way without it affecting me, and other times I tell the truth knowing it'll hurt someone in the room. I have times when I am heavily sarcastic in my comments and other times when I am not. One moment I will enjoy something beyond belief and the next I hate it. I've always thought I become bored easily, but I'm not so sure anymore. I dislike self-diagnosing myself, but that's why I'm asking for input from the community. I don't have friends to go to for things like this and the professionalism in my job would be degraded if I spoke out about this. I appreciate any input from you all.