How can I decrease stressed caused by worrying about my future?

I went into college right out of high school for nursing. I had plenty of stress due to the intense coursework and my grades, but I never worried about my future because I knew that there’s a lot of job security in nursing as well as good starting salaries. I knew I’d be able to support myself once I graduated and, in turn, I got the support from everyone around me.

It’s a long story, but I’m now working on my BA in Psychology with a minor in Business Administration with an interest in going into human resources, marketing/PR/advertising, or something similar. Because of this switch, I added over 2 years to the time I’ll be in college. I also added the risk of being one of those people with degrees that they never use or end up working some minimum wage job and struggling for the rest of my life.

I’m highly motivated, I’m smart, and I have a good head on my shoulders. However, I’m also a compulsive planner and I constantly worry about everything. Recently I’ve been spending way too much time online looking up jobs and salaries and costs of living on the internet, asking questions on forums, and I feel like I haven’t made much progress in easing my mind.

Since I switched majors, my parents no longer treat me as if I’m going to make it and be something important one day. I think they secretly feel as if I’ll fail. This is a foreign feeling to me. How can I stop worrying so much about the future? I have three years of school to go…I can’t do this the entire time!

I have a passion for studying psychology and I have a big interest in business. I know I have it in me to be successful, but I can’t help these feelings of self doubt when I’m surrounded by negativity everywhere I go. I simply don’t know what to do to make myself more confident that I will succeed and be able to support myself and be happy. Not just getting by with a crap job and a useless college degree.

Any advice is greatly appreciated.