If you want to do something, you should do it (This is what I think you mean)

People always say that when they have time, they do not have money. When they have money, they do not have time. When they have time and money, they are old. This seems all wrong. But I am agree that attitude is everthing. We can travel now. We so not don't have much money, but we are young. So, I decided to go to Hangzhou to see a friend. Then we can go to a the concert of in ZhouJielun.

Work on spaces between punctuation and capital letters after full stops. A few changes I made are just what I pressume you mean. Hopefully this makes sense to you.

If you want to do something, just do it!

People always often say that when they have time, they do not have money. when they have money, they do not have time. and when they have both time and money, they are already old. Seems that the things are all wrong. But I am agree that attitude is everything. We can travel now. We so not have much money, but we are young. So,I decided to go Hangzhou to see a friend. Then we can go the concert of ZhouJielun - even though I have neither time nor money. Don't procrastinate!