If you took your college courses before you graduate high school, then you should not generally be considered a transfer applicant. But you can check each college’s policy to be sure.
In general, unweighted GPA is the best means of comparison, unless the college specifies its GPA calculation method and you recalculate your GPA based on that method. A weighted GPA from your high school is generally not relevant outside of your high school, since weighted GPA calculations vary across high schools and college admission offices.