It's always too early to quit.
Begin to be now what you will be hereafter.
Either you run the day or the day runs you.
Go for it now. The future is promised to no one.
If you can dream it, you can do it.
The wise does at once what the fool does at last.
Know or listen to those who know.
If you've got a talent, protect it.
Well done is better than well said.
Be kind whenever possible. It is always possible.
There are simply more young people than there ever were. You get this feeling of strength. Also, large numbers can be a drawback, making it difficult to lose one's anonymity.
Teenagers today are more free to be themselves and to accept themselves.