I have millions of started not finished stories lol I agree its very hard to finish one, you just have to be determined and keep all of your mind open in case you come up with something that you hadnt thought of before,
And let plenty of people read them! Me and my friends have a switch going she gives me chapters and I give her chapters, she has read almost every story I have ever started to write
About the publishing thing, hmmm...i've never even tried to get that far I usually just write because I can, but I suppose if you find a good publisher (online or through a friend maybe) then you definitely have a chance of getting a book published
And I would read your stories and give you contructive critisim on them if you want to post them
Hope I helped!