How do i feel cheerful?
Know that he is in a better place, that he will always watch over you and be with you. Someday when it is time for you to go to the other side (people call it heaven) he will be waitng there for you. As you grow up, make sure he is included (or anyone that you have lost) in your big events in life. To make yourself cheerful do something that you love to do. I hope I have helped in some way.