holding onto the past

So this is a big problem with me recently and I wounded if anybody else had this same problem and also if you do this may help...

So bassicly I seem to hold onto the past instead of look to the future or even enjoy the present...my theory to why people hold onto the past is because memories are the only things that don't change. The two things that trigger a memory are- photographs and music.
This is rather annoying as I carn't just never look to photos or even worse listen to music (music is my life and I will be writting a post on this at a later date.) So what am I meant to do?
this of course isn't even photo and music I listen to normally the happy ones that remind me of happy times. But It's wierd to think though that when you think back to those specific happy times you imagine yourself REALLY happy but at the time you wasn't even that happy...just goes to show you really should make the most of something and be grateful to what you've got...
But I never know this time next year or whatever I might be looking back to writing this blog and thinking back and wishing I was that happy agian...