I just sent my Bitcoins to a Bitcoin Cash wallet by mistake, did i lost my coins? or will they be converted to Bitcoin Cash coins after August the first ?
Bitcoin Cash doesn't exists yet.
yah, but i used BitcoinABC Wallet and the transaction is successfully made
I'm not familiar with them but they seem to heavily supporting BCC.
Either way you should be able to withdraw your coins into a non-custodial wallet such as Electrum where you are in command of your private keys (and therefore actually owning your Bitcoins).
I'm not sure but I'd guess BitcoinABC is a custodial wallet in which case you're trusting them to handle your Bitcoins.
Whatever the case might be you should be able to withdraw your coins or get both BTC and BCC - otherwise you're being scammed.
BitcoinABC is like Bitcoin Core wallet, it downloads all the blockchain to Sync with the network (full node), the problem is that it uses different algorithm to generate the address from a private key.