What do you think?

No of course not ..
Happiness comes from within ..it's a mindset ...but it doesn't hurt to have people in your life that are good for you ..to inspire you in good ways is always a good thing

If the person around me is someone I care about - yes.

I think it's impossible for me to be happy knowing people I love are in pain or unhappy. However, I never strive for happiness in life. Being content is more important to me.

Yes, it does. As such, I try to surround myself with those who genuinely care for me, and are a good influence.

What Boldfinch said.