Future can be better

It is so complex to try to understand life. There are so many ups and downs. Some days I feel life is unfair to me. Sometimes I think it is not so bad. So why cant we consistently keep neither happy nor sad. In the long run i may not renember any of the daily troubles but i might want to relive some light memories. I read that i should not worry about the future cause who knows...the future could be much better. I sure hope so.