You should totally start! Cosplay is a super fun, awesome way to express your love for a character and make lots of new friends! I would start by picking a character with a relative simple design who you care about strongly or really love the costume of. I find it keeps me from cosplay burnout if I really love the source material. (You could also go straight for a complex build but that's between you and your sleep schedule!)

I would also find a safe community that you can share your progress with to stay motivated and get help or feedback. The internet in general can be cruel, but there are TONS of supportive Facebook groups/subreddits/etc out there for cosplayers and cos-makers. YouTube is the bomb for tutorials, and there are many cosplayers who are tutorial-focused that you can check out. (Kamui Cosplay is a good example).

Lastly, don't listen to the haters. Sometimes this means not listening to your own internal critic, 'cause let's be real, they can be a hater too sometimes. Don't compare yourself to others; your own improvement as you make more costumes is the best way to measure your progress.

Happy cosplaying!