How do you know if you're a bad playwright?

I have entered maybe 4 competitions and I have been rejected from all of them (they also stated that they do not offer feedback). The problem is with no feedback I do not know if I am a bad writer or if my story is just not the one for them. I suspect it might be a bit of both. I understand that being rejected is a bit of a sign but with no proper feedback how does one know where they stand?

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How did you learn where you stood in terms of talent and ability? Did/do you have a mentor you can trust? Did you ask an agent to read through? Did you pay someone?

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Thanks.