Definitely possible, and I wish you the best in following your aspirations. More people should follow that example!
I agree that the work you do now at the CC, and in the future toward your bachelors will be the main focal point... and one must always prepare to really kick some tail on the MCAT. That is huge.
Your years of experience in the psych environment will then be all the more helpful. Your GED could conceivably come up in an interview, and if you can discuss it in a pleasant and upbeat way, without coming off as defensive or whatever (I have seen it happen, and it ain't pretty), you should do well.
Best wishes on your journey!
