Transferring to another college is not like applying to college the first time.
Try to find someone that you think you can relate to - socially and mentally. Nothing is worse than being the one who 'shoulda-seen-it-coming' when a person's old habits repeat themselves. Separate your relationship from your school responsibilities.
If you've decided to be a doctor and your college has a weak pre-med program, don't be afraid to look elsewhere.
Some students who are rejected from their first-choice school attend another school with the intention of later transferring.
The difference in reputation between your old school and your new one may not justify the time and effort of transferring. Pay a visit to the campus of your prospective school, chat with current students, and be sure to sit in on the specific classes that interest you.
You don't want to find yourself transferring...again.