It doesn't really matter if You are a pessimist or an optimist. I think it depends on who You are surrounded by. With ones You can feel alive and happy that You can't even contain yourself calm. And with others it's so sad and depressed You wanna die or just be across the world it's so stupid.
Or if You are really really the pessimist, even good people near You probably won't brighten the day. Sometimes it seems so.