Failure is not always the opposite of success.
My stepfather was a smart man in so many ways and he taught me a lot.
I wanted to do something and asked him to help me. I told him I couldn't do it and needed him to help me. What he said has stuck with me all the rest of my life. He told me that trying something and not succeeding was not a failure.
The attitude of “I can't” ensured you were right. To not even try because of the attitude that “I can't” is a failure.
I have tried many things over the years with out the fear of failure. Not every thing I have tried has been successful but I haven't had a failure yet. Some of my tryouts have been far short of success. I will put my success rate up against anyone though.
I have had people look at my drums or my artwork and say I wish I could do that. I tell them to try it and I'll help. But the usual response is I can't with one reason or another added to demonstrate their inability.
I think to myself, “Then no, you can't.”
I know there are things I can't do, especially now that I am older. I will never climb Everest or K2 because I can't. I don't have the voice to sing so a career in music is out for me. There is nothing wrong with recognizing your limitations; real limitations. What is wrong is putting limitations on yourself because you are afraid of failure.
Try it; if you are not successful you didn't fail. If you don't try it, you've failed already.
So get out there and try something you have always wanted to do and don't do it with an “I can't” attitude or sure enough, you will be right.