Congratulations, So_punk_rock! Happy 18th birthday!
Chances are you will change this coming year or two or three. How much control you have over the change or changes may only be discernible afterwards. Sometimes "success" involves adapting to uncontrolled change rather than causing change.

It seems you have been thinking about what you really want in life -- that's super! Have you be able to sift out those dreams that are truly your own from those "dreams" or desires others want you to have? You are constantly being influenced. It's certainly not wrong to be influenced -- we all are. My observation (not advice): many people would be happier if they were to identify and examine what and who is trying to influence them, and then tune into the few that really speak to their hearts and tune out the many that don't.

Again, I wish you an exceptionally happy and fulfilling 18th year!