That would be excellent :)
However, perhaps Photoshop might not be the best tool to use. It costs $240/year for Photoshop, which is a bit of a high price for casual/occasional users.
For someone who's completely new to image editing, perhaps a free tool is more appropriate to get their feet wet. For example, you could use Picozu, which doesn't even require installing software.
Also, I don't see any reason not to use your Citizen for your guide - it's about the photography, not the watch ;)
1: You're 18, you'll find significantly better relationships as you get farther and farther away from High School. I know it hurts, but in the long-run this loss will be a very minor one.
2: Your "Best Friend" will likely regret blowing it with such a pretty girl. It may be an assumption, but you look like an intelligent gal who values hard work and being in the know.
3: You can use a site like this to edit your images - https://www.picozu.com/