Am I bipolar or am I just depressed?

For the past few years I have been fighting very upsetting thoughts. Thoughts of suicide and so on have been constant on my mind for that period of time. I have been to a couple of different counselors and a psychiatrist all of which have had different thoughts. The two counselors I have spoken with believe I have the symtoms of bipolar disorder and the psychiatrist believes that's not so much the case and it is just depression and alot of anxiety. I have tried a few med's for depression and they have just made things worse for me so at the moment i'm not taking anything. When people are around that i like, i am constantly happy and having a good time. But when i'm alone I get the bad thoughts and cry quite often. Also alot of little things really get me heated. I have become very cynical because of all this and I was just wondering if anyone else had an opinion?