I would agree with what everyone else has said. Crohns is not you, you are your own person.
Dating sites are a minefield. Have you got any interests/hobies that could get you meeting other people. If you have an interest you are far more likely to be able to engage someone in conversation.
Even for 'healthy' people it can take forever to find Mr/Miss right so don't be downhearted if it takes a few attempts. There is someone for everyone!
Good Luck