I am a graphic designer by profession, so here is my 2 pence.
Design is more of a natural skill, not something you really learn IMHO.
As you find it is something you enjoy, that is great. Just keep of doing it and you will start to discover that you may actually be good at it. It could be your hidden skill.
Yeah, you can do a course, but that just teaches you the technicalities of design. While not essential to enter the design World, they do give you a good grounding into what design is and how it all works.
I did A-Level Graphics, then a BA Graphic Design Degree. The courses, as I said don't teach you "Design" , but the technical aspects of the craft. I always intended to go into design, so I took the academic route. My degree has not actually benefited my professional life, it is more a formality.
You may find that you do have an eye for designing well, and all you need to do is start creating stuff. At the end of the day if what you do fits what the client want - you are a designer.
Working on a laptop is painful! In my studio I have 3 24" Dells. If you a designer the more work space you have the better!
I also work on a PC, never got on with macs, and don't listen to anyone who says Macs are what designers use & better. PCs actually have more to offer for the price.
Get a subscription to Adobe Creative Cloud and get access to all the tools for a monthly fee.
Get creative, and start working on some designs. Make up a brand. Do a logo, create some literature and see if it looks good or pants.
Just don't get into the trap of "All the gear, no idea"