Don't put yourself down, set your sights high and go for it :)
In the early days I found recording what I could do and then recording again after each few weeks practice, helped show me I was getting somewhere.
All the tools you need are on this site.
At various points it will seem like you've hit a brick wall, just keep going, it's the same for all of us, dare I say, including Mr S when he was a beginner.
Short fingers can be helped along with a slim/narrow neck.
Try a few guitars at your local guitar shop and see if any are better suited to you.
Regards.
Den.