I will be graduating with a Psychology degree, but I'm not interested in it

Hell my name is Matthew, I will be soon graduating, with a degree is psychology, but have come to realize that I'm not really that interested in it. I don't feel I'm being challenged and I'm starting to express an interest in being able to see the "fruits of my labor". I've always been interested in solar energy and other various forms of renewable energy type sources too. I looked a little bit into it, to my understanding looks like those are part of environmental engineering programs, of which from what I found those are couple with chemical and mechanical engineering degrees, does that sound about right? Also what is the market for renewable energy type engineering? Or just say a degree in either chemical or mechanical engineering? If you could provide me with links for more information, that'd be greatly appreciated too.
posted by Matt, NY on June 8, 2014