You actually can do things, don't put yourself down! You already came up with an idea all on your own, you can handle it!
Anything you don't know, you can learn.
If time is lacking, just reduce the scope of your project to only one or two elements to demo your idea.
Hop onto paint and a construct 2 tutorial or someting similar and see how far you can go :) Heck, just make pixel art of your reptile person or something, it is not easy but it is attainable!