Okay then... couple o' things right off the bat.

First, creating anything is never, ever, a waste of anything. Make something new that never existed before from your own imagination, and use all the electricity you can scrape together to do it, and you'll be doing a good thing. Promise.

Second, realize that there are (at last count) over six billion people on this little blue marble floating around the sun, and some of them are not going to like your work. This is true for all of us, and you can't let it affect you. Conversely, some of us are going to love your work, some will like it and want to critique and help make it better, and some of us will be jealous that you got the thing finished (I never seem to finish any of my animations...)

Now that that's out of the way, let me also say that you need to believe in yourself. Doing an animation by yourself means that you have many, many different jobs to do, from writing the script to rendering the scenes to compositing the final product. You may not be good at every separate aspect, but that doesn't mean you suck. Don't be hard on yourself, there's plenty of other people who'll try to do that to you in your life. Think positive, and know that there's people (especially 'round here) who will support you.

Also allow yourself to ask for help; you never know who's interested. FWIW, I do my own voice work for my animations (the ones that never get finished... sigh). I do acting as a hobby, and I've done a couple of radio and television commercials. I've got voice changing software that I can use to do a whole bunch of different voices. If you're interested, I'd be happy to help with the audio for your project; just let me know.