Keep a journal and record some of the events of your life during the day. Record some of the little things you do/did to help people – how you added smiles and happiness to the people you met throughout the day. It is not about you – it is about them. Strangers and friends and family.
That happiness, their happiness, can/will make you smile at the end of the day. It will help you sleep well.
Do it again the next day – try doing little things to help people smile. It is ok if at first you write nothing down – spend more time figuring out how to help people smile throughout the day without them focusing on you.
Keep writing it down. Keep doing it more. Keep trying. Keep breaking old habits as you create this new habit – of manifesting happiness. At some point writing it down is no longer important.