I think its a great idea to major in psych! 🙂 I'm a psych major, too. I initially chose psych because I enjoyed the college psych classes I took in high school and did well in them. You don't really NEED to minor in anything but if you choose to, minor in what you like. I just recently opted to pick up a double major, tagging a bio major onto my psych one. I did it because it was a matter of just a few extra classes that I would have taken anyway to boost up my science GPA but moreover because I've really found that I enjoy learning biology. You'll be happiest, and do best in classes in which you enjoy the material you're studying.