Hey Matt,
I applaud you for wanting to overcome your fear of public speaking. The more you practice in front of people the less intimidating it becomes. The best way to minimize the fear is through preparation. That is, know your shit. I'll repeat, KNOW YOUR SHIT! Know it in your sleep, cold, inside and out. Having just said that, also expect the unexpected. I still have to push the fear aside every time I speak in front of people. It isn't as bad as when I was your age but it's still there sometimes. Again, preparation helps lessen the fear. (At least for me.) Keep in mind that there are different styles of delivery in public speaking depending on your target audience. For example, speaking in front of people in a comedy club who paid money to be entertained is different than motivational-type speaking, or speaking in a court room or business a setting. But using comedy is best the way to soften up a crowd. If you chose the stand-up comedy route, go for it, "balls to the walls!" You only live once, right?
My sister went to NYC to pursue a career as a stand-up comic. One of the first things she did was to take a stand up comedy class offered by one of the local comedy troops. She said they had to write and perform a lot of mock stand-up exercises in front of the class. The class would give each other feedback to refine each others delivery, timing, etc. They also worked on handling different types of audiences. Then, for the final class assignment, they all had to go to a Comedy club together and perform individually in front of an audience. She said she had a great time, every class was a blast, and she met some really funny people, and made some great contacts to bounce ideas off of and get advice from. Now, she's done quite a few amateur stand-up nights. I don't know if she's done any paying gigs as of yet. She gave herself 2 years to try the comedy thing. She's probably gonna be a lawyer like you, except she chose to postpone law school to pursue comedy first. Best of luck in your pursuits.