Many people mix opinion with fact. Unless you search for the facts, you're just repeating another person's opinion - and most likely stretching the truth (like a secret and passing it on). And, perception is not always reality. Get the facts yourself!
Sometimes you stop in life and think that you can't do something. But actually, you can. Trust that. Go for it. It's worth it. Do what you need to. It's worth it in the end. As I aim for that Senior Developer position