Telling someone to "grow up" just cause they don't want to talk about their problems is kind of lame. You don't have to unload on someone just cause they want to know your business. This is where you have to find someone you trust....A close friend or a close family member, someone who won't "use" it against you when the going gets tough. If these people don't exist in your life (yet) then unloading online is probably the safest way.
Even if people don't totally understand where your coming from....And this is difficult for the human mind to understand everything fully, because of different circumstances...The way we were brought up, whether your family are supportive or whether they're jerks, whether there is a disability involved or neglect/sustance abuse etc......People can give empathy.
Finding someone who empathizes with your situation is probably what you want...........Keeping it all inside leads to thoughts of depression and even suicide.

i think it helps to talk about problems because it releases stress about them but u should be able to do this when u want to

Bump

I think when you say "grow up" it shuts the person down and makes them not want to share. I think learning to share your feelings with a person or two that you can trust is actually very healthy....In a world that has so much negativity in it, I fear that many young people are learning to shut down and turn inward... Not a good thing.
Sharing is good for the soul, (when one is willing) and it reinforces communication skills which are necessary in life, family, relationships, jobs etc.
Bottom line, it's not what you tell someone, it's how you tell them. If someone told me to grow up and talk about what's bothering me, I would find someone else to share with!