It ok - user acquisition is tough! It takes a lot of work, and submitting your link to Hacker News is not really work. I'd start out by doing some user testing

It ok - user acquisition is tough! It takes a lot of work, and submitting your link to Hacker News is not really work. I'd start out by doing some user testing. Have people look at your site and tell you what they think. Then maybe a bit of usability testing - tell people to perform actions (like signing up or adding a product to their list) and see where they get stuck. This is called funnel optimization. Then you can focus on finding channels - ways people discover you. You'll probably want to spend some money on google adwords, but definitely also try to get some press through traditional media and blogs. You haven't failed - you just started!