no one can help you but yourself, surely you have caught his eye that he's asked you out on a date, so you cant be that bad. Just accept and go for it.
Easier said than done - but try to pay more attention to enjoying his company, than wondering if he is assessing and judging you.
Remember, he is probably just as nervous and se;f-concious as well, and it is just a date, you are not eloping!
Relax, be interested in him, stay calm, and you'll be amazed how much you will enjoy yourself, and have the confidence to go out again if you like him.
Life's short
If you've got a chance of happiness, go for it
He must have confidence in you if he's asked you out
Borrow some of his confidence and yours will grow.
Here...................................
have some of mine!
x x x
Give it a go.
Treat the evening as if you were going out with good friends or colleagues. No high expectations and just be yourself as you would be with friends. You never know what it may lead to eventually. You have nothing to lose.
Good luck. and enjoy.