So, I ditto everything the four people ahead of me said. What I loved the most:
-Brandy1017's suggestions of alternate careers to look at, just in case. To that, I would add physical/occupational therapy assisting (those are the ones I always consider when I feel like nursing will be too much for me). You'll still be in direct contact with patients, but it's more scheduled and allows you individual time to help patients work through their therapies. You would be supervised by a physical or occupational therapist, who would plan the interventions that you implement. (I just want someone around me to pick up one of those careers - I think they sound so great, but I'm resigning myself to the craziness of being an RN, lol.)
-Loriangel14's point. Nursing and a lot of the careers posted above still involve a lot of being around people. See if you can shadow a medical technologist or someone else with a more behind-the-scenes role in healthcare. If you enjoy the bio classes but direct patient care is not your thing, that might be a great alternative.
-Missnurse01 is absolutely right about shadowing. As you said, you don't want to waste time or money pursuing something you hate, so shadowing, interviewing, and observing wherever possible will give you a much better idea of what you want to do than just reading about a career on the internet. Use your connections, call different facilities in your area, and see what they can do for you. HIPAA will complicate this endeavor somewhat, but you should at least get the chance to interview someone in these positions before making a decision.
-Compassion_x speaks the truth. Story time: I am a pretty shy person by nature, and not the best small talker. For a while I was sure that this would impede my ability to be a good nurse, or really interact with people in almost any setting. After enough group projects and presentations throughout college and pre-reqs, I've had to get wayyyyy over that. I'm still a 100% introvert, but I feel like now I can genuinely enjoy talking (and listening) to people since just practicing the skill enough. I figure that it's the same way with patient care: I will be starting a CNA position in a couple weeks where I work currently. Clinicals were kind of rough for me, but I paid attention and did my best, and I'm under no illusions about what the learning curve will be like for a while. But I'm giving myself the time and allowance to make some mistakes and feel uncomfortable, so it's not a verdict on whether I'll be a good nurse someday or not.
BASICALLY: Only you can decide whether you've got some jitters about your new job, or if this entire role of nursing is in conflict with who you are. I wish you luck in clarifying which it is.