This thing is easy to understand. You have to pay before you get. That's the way we do in this world. You want somethings, so you have to pay for it. You can't expect people give you what you want without any conditions.
Sacrifice is needed so that we can get what we want and wish. It's just a give and take situation where you have to GIVE in case to TAKE. Why can't we just have a wider sight of view instead of that narrow one.
I have started to miss my former classmates. I miss you all.
Though, learn to accept change and new things are more important than missing those past. We have to learn and adapt our self so that we can stay still not fall back.