Being depressed can make it difficult to pay attention and focus, which can affect memory. Stress and anxiety can also get in the way of concentration. When you are tense and your mind is overstimulated or distracted, your ability to remember can suffer.

Condition where you choose things you want to forget not always on purpose.

1. When you know how to do something really well, but when you try to show people you suddenly can't seem to do it.
2. When you can do something without thinking about it, but when you consciously engage in said activity, you constantly fail at it.

When an adult forgets completely what they were like as a child, so they think no young teen ever swears, that they all want sex so shouldn't date, and care about some stupid jokes, because they forget that as a kid they did swear, they didn't have sex till much later in their life, and they hated those jokes.

When you can't remember things for short periods of time. Also when you can't remember things for short periods of time.

When you forget things because you smoke a lot.

When you send a snapchat and the person replies, but you forgot what you said originally