Big, big, red flags. Come on, you see them, I know you do.
This "fear" is because you doubt yourself that you can find someone, so you cling onto someone who I assume "asks you to be his boyfriend" .
I assume he's seen you? How does he know who you are, what you look like?
And you haven't seen him, yet you've said as Roger said, "yes" to being his girlfriend.
He could be anyone, a dangerous person, an unattractive person perhaps, it could be something simple but it could be something very scary.
Don't you think it's time to push the issue or tell him you can't continue as you do not know who he really is, until you see him as well.
If you feel that he is concerned you won't like his presence then advise him that you accepted the relationship on personality and that is what matters .
But do it.