Definitely finish it! Even if it doesn't get recognition, the act of pushing through to the end is a VERY valuable one that will actually help you quite a bit as far as improving your artistic craft.
And believe it or not, even with art that isn't 'great' its totally possible to find a following and people who support and appreciate your work. I still get people reaching out to me about a comic I ran years and years ago that really wasn't great, and I would never in a million years think of publishing again. I absolutely hate the thing, but to other people it still really means a lot.
Keep chipping away at your craft, and keep growing, but don't be afraid to put your work out there. You never know who it might inspire.