what about 18 years old? am I teenager or young adult? actually,in my circle said that at this age we're too young to share our opinion about politic, or having debate about something. and sometimes people say that we are too old to having fun.

Both are 2 different things. Of course you are a teenager but saying young adult won't be wrong. Now a days the new generation is super updated than it used to be a decades ago. This is a time of technology, easy communication Now even a 10 yrs child have the access to the phone, they learn fast becoz of having access to phone in early age, keep updating themselves from social media. This tech world has made the children advance, so it won't be wrong to say , yes ,they have learned making decision and know what is right for them, but you can't deny that an experienced person has far more great descison making skills. so don't compete with the person who is older than you,but hey you can't be underestimated if you are serious to work. believe in yourself.

Oh Yeah

Don't pay attention on backseat driver..they are doing there work. you need to do yours as well.