Is it possible to just not have a hymen?

yea ive neva had before and after a lill feeling around(gross i know but youd be lying if uve neva did it ) and i dont think i have a hymen at all or it broke when i was in the fourth grade and thought that wuz ma first period .(the next one didnt come untill 4 mounts later)(but the first two years of perbuty are supposed to be wierd) but now im in 10th grade and i think i just never had a hymen