Love or nah?

Kay
Ladies...how do you know if you're in love or not? I feel like I am but I'm hesitant to believe it because all I hear people say is "you're too young to know real love"(I'm 19). imo you can love at any age but my bf & I say "I love you"  to each other all the time randomly & never end a convo w/o it. Feels real to me I know he means it not only does he say it he shows it as well! But I can't help but think about my friends who I've  personally witnessed get heartbroken & the fact that guys can be really trifling but my bf hasn't given me any reason to distrust him😔I'm sort of confused so I'd love to hear your stories on love!