Hi Emily,
Don't over think this. You're young, you have a lot of life ahead of you to work through stuff.

Hamster has a point though- you may want to re-think nursing if you have trouble with social anxiety and are not ready for treatment. More importantly, you shouldn't be afraid to get help to work through that anxiety. Maybe go to your school counselor first, and s/he can help you find a therapist that can help you learn to accept who you are and work through whatever questions you have about yourself.

And, for the record, plenty of people have extremely happy, fulfilling marriages and lives with someone of the same sex.

Take care of yourself
-Bee