If you would like to let go but can't, then accept it could be that you are not truly ready yet. Practice self-compassion and try some mindfulness exercises because these can help you to reach a more peaceful emotional state that may help you to identify what is holding you back from letting go. As well as writing down your thoughts and feelings, try to observe your negative thoughts as they occur rather than being swept up in them. Another important thing to do is to realise that you cannot change situations – not fully, at least – and the only thing you are in control over is how you feel about them. After you make that leap, it is simply a question of how long it will take you to let go, not whether you will or not.