Solitude

comprehension
Stanza one means most people want to be around happy people.'laugh and the world laughs with you'.

figurative language

• laugh and the world laughs with you hyperbole 
• Laugh and laugh is repetition it helps make ryme
• Internal rhyme full measure of all your pleasure 
• pronoun eat and your halls are crowded the halls arn't crowded
• hyperbole sing and the hills will answer;

Stanza 2
If you do something good good things will happen back to you.'They want full measure of your pleasure'.

Stanza 3
Do not commit things you will regret like suicide.'But no man can help you die'.

Death
Don't be afraid to accept things your not comfortable with like dying.'But one by one we must all file on through the narrow aisles of pain'.