Dr. Seuss was turned down by 27 publishers before one accepted And To Think That I Saw It On Mulberry Street.
27! He had to keep believing that what he was doing was right, after 27 experts told him he wasn't worth publishing.
If you think you can, you're right. If you think you can't, you're right. Don't let others change your mind, if you're right.
Hang in there. If you know you're doing the right thing, keep doing it and wait for God to open that door.