How do you know when your having contractions ?

well mine had me crying and yelling

real contractions are every couple min if it's Braxton hicks they are not consistent. timing is a good way and to help they say if you lay down on your back and drink some water that Braxton hicks will stop but real contractions won't stop

What do Braxton hicks feel like? I'm a first time mom so this is all new to me