Any tips on getting in shape fast?

Fast weight loss or fast fitness, either one: Bad plan. You can look good. "Fast" isn't a great way to make that happen. "Fast" is more likely the route to haggard, hair thinning, brittle nails, low energy, muscle loss, health risks, eventual regain, and more bad stuff.

Find a way of eating sensibly reduced calories that you can stick with long term - ideally forever, because I'm betting you'd like to look good ("be in shape") for the rest of your life, not just briefly. (Something like 80% of people regain lost weight. Don't be one of them. "Fast" is a good way to join them.)

Adopt a fun (or at least tolerable, practical) exercise routine that fits into your life well, one that's just a manageable challenge not punitive. Make it appearance-focused, if looking good is your main goal. That probably means mostly strength training, with enough cardio in the mix to give you attractive energy and glowing good health. Increase duration, intensity, or frequency as you get fitter (or change exercise details) to keep the challenge in the picture, in order to keep making progress.

Don't get in shape fast. Get in shape effectively and permanently. You're only 19. You've got a lot of decades ahead of you that will benefit from ongoing good health and good looks.