I never knew I need to put in a payment id
does this mean I lost all my dashcoin
If you are sending to an exchange, try to contact the exchange owner with your transaction id, link to the blockchain and the exact amount of the sent coins. You have a slim chance to get your money this way, but I cannot guarantee it will work.
If it was to Subtoshi, I try to recover coins sent without a payment id. If you include the transaction id when emailing support, then I can generally recover your coins in under an hour. To find your transaction id, search simplewallet.log for the command you typed to send the coins, and the transaction id should be listed below that.