Adolescence /ˌæd

fulfil , US usually fulfill /fʊlˈfɪl/ verb [ T ] SATISFY
2. to satisfy; to make happy
I don't feel that my present way of life really fulfils me.
[ R ] I've finally found a job in which I can fulfil myself (= completely develop my abilities and interests) .
improve /ɪmˈpruːv/ verb [ I or T ]
to (cause something to) get better
He did a lot to improve conditions for factory workers.
I thought the best way to improve my French was to live in France.
Her health has improved dramatically since she started on this new diet.
motivate /ˈməʊ.tɪ.veɪt/ /ˈmoʊ.t ̬ɪ-/ verb
1. [ T often passive ] to cause someone to behave in a particular way
Like so many people, he's motivated by greed.
He is genuinely motivated by a desire to help people.
2. [ T ] to make someone want to do something well
[ + to infinitive ] Teaching is all about motivating people to learn.
participate /pɑːˈtɪs.ɪ.peɪt/ /pɑːrˈtɪs.ə-/ verb [ I ]
to take part in or become involved in an activity
She never participates in any of our discussions, does she?