You have fear when you are not confident in your own personal powers of creation. You are not confident you can manifest the future that you want by using your willpower. And because of this you hang on to the past. It’s a reality you know and have experienced and this makes the past secure to you. It’s a false sense of security though. But to you and your mind it is secure because it is something that has happened and you know this and gain security from it.
It’s only when you gain confidence in your own personal powers of creation will you be able to give up your attachment to the past. To this false sense of security and move fearlessly and confidently into the future. For you know now that you can create what you want in life. Having a clear vision of your future and putting your will behind this vision, you can manifest what you want. Be confident in your own powers of creation.