Low self-esteem is one of the most prominent symptoms of depression, and the negative self concept which is born out of low self-esteem makes us feel bad about ourselves. Your BF is not the right person for you if he cannot understand that if sometimes you don't want to sex with him it is in no way a rejection of him, but is because of how you are feeling about yourself.

Hating yourself is not going to improve your mood, but finding someone who is more understanding and tolerant of your condition may help.