How do I figure out which horoscope sign that I'm born in if it's on the cusp?

Basically you read both signs and take the one you like best and discard the other one. No, seriously, you need to read up on each sign and see which sign is more "you" than the other one. Cusp babies are usually more one sign than the other.

There's only one problem if you read your daily stars, in some papers you will be the previous sign... usually the trashy papers and not the broadsheets.

The star gazers tend to be the ones who also have a crystal ball... say no-more

You can find out what your real sign is if you know exactly the time of birth, so you can make a chart.
Personally I don't believe in daily stars explanation. If you like I can find it out for you if you give me the time, place and date of birth. A real chart is personal and a blue print of your character. Let me know.