Reddit user bloomytue has gone through the trouble of organizing and categorizing videos of all of Lionel Messi's goals, plus interviews and other video, all on one site. Just click here.
You'll have to login or create an account to watch, but it's free. And, if you use a made-up email, I don't think it really catches you. I mean. Just saying.
The goals are organized by year and by whether they were scored with Barcelona or Argentina. There are also behind-the-scenes videos and articles which explain some of the records he owns.
What are you waiting for? Time to do an archive binge.