When Jesus came to wash Peter's feet at the Last Supper, Peter was shocked and asked him what in the world he was doing.
"What I am doing you do not understand now, but afterward you will understand," Jesus said to him.
That is the perfect commentary on the Christian life. Most of the time when Jesus does something in our lives, we don't understand. We are shocked and just want to know what Jesus is doing. However, most of the time he doesn't tell us. He just says that later we'll get it.
That's hard for people to grasp. We think that if we just knew what was happening right now then it would all be OK. However, that takes the trust of our relationship with God. We have to have faith that he knows what he's doing.
Also, some people think that they will eventually understand everything that happens to them. Say there's a death in the family - you think "Fine, I don't get it now, but later I'll understand why she had to die." When you still don't understand in a few years, you might get even more frustrated and think that God isn't doing his part and explaining himself.
We might not always understand why things happen when we're still on the Earth. We might only understand why we lived through what we lived through when we're no longer on this Earth, when we're in heaven.
So if you don't get what God is doing in your life right now, don't worry. Know that Peter was in the same spot.