Helen Mary Jones of Youth Cymru told ITV News young people need more encouragement to help better themselves during education.
1 in 5 young people currently believe they will end up on benefits if they do badly at school.
She said there must be better alternatives to academic education and young people must be given priority to not become a 'lost generation'.
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A survey found the posts included comments about the teachers competence, and appearance.
Temperatures will rise steadily in the strong June sunshine.
The Welsh Conservatives say the Swansea project should go ahead despite indications the UK Government may be about to turn it down.