I think if he's the right guy and you feel like its the right time to tell him, you 'll know. Maybe you don't go into too much detail in the beginning but tell him you have some challenges that you work on with anxiety and depression and leave it at that. In my experience usually, if they are interested in you, they'll ask more questions and it will lead to an honest, open conversation. If he's truly a great guy, he'll stick around. There are some great guys out there. Good luck and don't be embarssed by your situation- you have challenges and everyone does! No big deal sista!