There is no way for us to know if you are a good actress or not from this post. If it's what you love to do, then keep trying. Only you can decide if/when you've had enough of trying. If you feel you can do "one more" audition. DO it.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.