How do you know if your in labor? Ftm

Jessica
Ok so I know it might sound stupid but I really don't know how to tell if I'm in labor or not. I've been having braxton hicks for over 2 weeks but within the past couple days I've started getting contractions with pain added and not just the tightness that comes with braxton hicks. I have contractions everyday but they are not real long. Most last around 10 seconds. Some have lasted around 20 second but they are often. When one passes another one normally comes within 3 to 5 mins. I normally have a high tolerance for pain so I'm worried that I'm going to think nothing of the pain like normal and then next thing you know it's to late. Being a Ftm makes this all new for me and with labor being different for everyone idk what to expect.