Think about this. If Poe just told you someone was scared instead of showing you, would we still be reading his books today? No. As a reader, you have to see it and experience it to enjoy it. Saying something is scary is rather anti-climatic. You want me to show you scary where you get chills and find yourself looking over your shoulder.
Remember that many people are visual in nature. They need to see something to process it. Even if the ‘seeing’ is in the mind only, they need to see it. They need to feel like they are there and experiencing. That makes the experience more real and the effect lasts longer.
So how do you correct having too much tell and too little show? Start with having someone else read a scene and point out areas they feel could be more visual to them. Then look at the scene yourself. Ask yourself if are telling an emotion or fact instead of showing it. You say that Aunt Joan is paranoid. Are you showing the reader that? You say that John can’t be trusted. Show the reader that through his actions and flashbacks. Let me as the reader conclude what you want me to see and believe.
A great resource for you is the Emotion Thesaurus. Instead of telling me Dan is angry, show me. This book will help you with body language to show the reader that Dan is angry. When he frowns and drums his fingers, it could be anger. You don’t have to tell the reader that he is when they can see him being angry.