After taking time to read up a little it is possible you might have corrupted the bootloader or there was none on there to start with ?
There are a few ways to re-install the bootloader but the easiest is to try and hold down the RESET button at the correct time during upload.
Quite often if that method fails it usually means you need an additional bit of hardware and that can range from another Arduino to a cheap dedicated ICSP device which is very cheap.