try raising your voice, be obnoxious etc
huh? when someone says guys act immature, they just mean that guys act immature. there's no hidden meaning to it.
she will be so immature that she changes for you. but if shes under12 she will act like she hates you.
Let the fraction act improper. All fractions can be immature!
If you have to pretend like your mature then theres no point. Some people are naturally mature and others are innately immature.
somewhat immature and wild and annoying
People often act immature as a result of insecurity, especially if they aren't sure how to handle a particular situation. If a change in behavior and maturity is sudden, it may in rare cases indicate mental illness or brain injury.
Most of the times they are too shy and immature. They don't know how to react and act foolish in front of their crush.
When you say "people", thats a very broad term, not all people act immature and weird. i guess it also depends on what you think is immature and weird, people have different opinions on behaviour. Also you need to think that if 'everyone' is acting weird it could maybe be you...
It kind of sucks. Don't act immature or the upperclassmen will hate you.
It mean you not act your age. Having or showing emotional or intellectual development appropriate to someone younger.
Someone that would act younger than they actually are, or are not physically developed all the way
because they are ignorant and immature little kids and act like dumb little kids :)