I was out with friends today and suddenly i burst out of crying without any reason, i really don't know what wrong/felt so confused/what's wrong?

Confusion!?: Many things can be happening: sleep issues, less sleep causes confusion, tearing confusion and extreme mood swings, possibly panic especially if you are taking too much coffee. Hormonal changes at your age are a possible culprit too get your thyroid checked. Psychological reasons can also present this way especially anxiety disorders. It won't hurt to get a pregnancy test.