There are sometimes a person knows the things he wants to do or similar things but he feels he cannot or unable to do them. A person should not let that feeling control his life. He should try his best to ignore it and do the things he really wants to do if he thinks he can. There are differences between a person knows ( in his thoughts) or feels he can or cannot do a specific thing.
Usually if a person feels anything ( he can or cannot) his actions will show it. He should try his best to do the things he wants to do if he is really convinced in them. Most of the times when a person feels he cannot do a specific thing new in his life, it is because his fear of failing and other people’s reactions towards him.
A person should try to be brave enough to do the things he wants because if he was not brave, he will never be the person he wants to be or reach the goal he wants. Most of the times when a person feels or thinks he cannot do the things he wants , it is because of his thoughts and being unsure about the information he has about that goal.