Fidden Farm campsite on the Isle of Mull - absolute heaven!

Hi everyone, I'm a third year PhD student, trying to finish my experiments and write-up. Throughout my whole PhD I have felt completely inadequate and not had any encouragement from my supervisor. He's a very difficult person - bad-termpered, moody etc. e.g. when you say hello to him as you pass him in the corridor he blanks you. Everytime I go to speak to him, I dread it. The other people in the group also find him very difficult to deal with. During my MSc I had a nice supervisor who made me feel as though I belonged in science and I did really well. My current supervisor makes me feel the opposite, I'm even concerned I won't get my PhD. I do have a second supervisor, but I have only seen him about 3 times during my PhD and I don't really have anyone I can talk to about this.

Could someone please tell me if they have had any similar experiences of feeling completely inadequate, like a bad student (when I'm sure I'm not!) and after three years, no longer having any self-confidence and wanting to quit?

Thank you!