What do contractions feel like?

Ashley

So im 35 weeks and i every time i ask someone how ill know im in labor or if im having contractions they just say "oh you'll know" but like that doesnt help very much. Ive had tightness in my stomach on and off since about maybe 28 weeks. I assumed that was Braxton hicks. It wasnt painful but it was uncomfortable. Im just curious what actual contractions feel like and will i not realize its the real thing until its too late? We live about 30 minutes from the hospital and im just scared i wont realize its the real deal