whats wrong with me

I wonder why did I get those feelings? I thought i should be happy over it? instead of that my heart sank. perhaps thats human nature, when you have it you did not know how to treasure. But when you lost it you start to have deep thoughts on it and somehow regret. Time that passes cant be rewind again. It can only taken as memories. Guess i need to try to forget all those things and continue with life...