For some people it's only natural to doubt things. But it's much more useful to focus on what we can do. Doubting things per se won't change a lot, or at all. If you doubt a concept, you've got to search the truth. If you doubt an action that is done, you've got to act so that it can be improved and won't be repeated.
However, when people do not doubt things, not many improvements can be made. I see people who push away doubts as wanting to be safe, and lazy to find out the meaning of the subject of their doubt; or making a change to progress further from the initial state. So, doubting is necessarily a first step towards making progress.
At certain age, if you are doubting a lot of things around you but yourself, you are basically normal. You'd probably see every single thing critically, judging its worth and more often you'll find things are not up to your expectation, and you know that things should be or have/had to be better than how they are/were.
You would probably also think that you don't need advice from anyone because you can think for yourself and you have opinion(s). Or maybe other people don't understand your complex mind... but, for what it's worth, listen, or at least, try to listen.
I doubted a lot of things at that age. However, as I didn't talk about it to the right person, I wasted my time criticizing things around me rather than doing something that I could do to make things better. The only consolation: I was focused on my studies. But the 'bad' thing was, I doubted my own faith. But that's another story.
When you doubt things, you exercise your evaluation skill. If you are doubting the education system, you are concerned about its effectiveness. So, do more than what is given to you, or demanded from you. Equip yourself with knowledge through reading a lot, and gain skills by getting involved with projects or activity that may help you live, work, function better in the years to come.
Whatever you think about an issue, work out some solution to it--if you become popular, contest in an election, and you may become a savior. You can't do much on a large scale if you don't have power in this country. But that should not be an excuse not to do anything on a small scale of course. And of course, again, that starts with yourself. And doing the right thing with integrity means that you'd still do it even though other people don't know it, and regardless of appreciation or recognition. Religions teach you that what goes round comes round, so pay it forward.. it is karma, and although the world is not perfect; god is perfect and just so there's life after life.
And, be patient, because you'll know and realize the truth about what you're doubting all in good time. The older you get, the wiser you'll become. Hopefully.
