How do I know I orgasmed during my first masturbation ?

I am an 18-year-old virgin in a strict society that forbids girls to go out with guys ..I never had sex because ,according to society ,i should stay virgin till the wedding night..sounds medieval huh ?
Anyways ..I was watching a stimulating vidoe and started rubbing myself frantically ..It was the first time I do that ..
I felt something was building inside me slowly it felt like ..like an explosion was about to take place ..i felt a constriction in my throat as if I am choking ..but the pleasure was powerful ..its like flying and being electrified by sth ..I rubbed more and felt I can't breath ..the air left my lungs and there was a burning sensation in my chest ..I thought I was having a heart attack ..an extremely pleasurable one at that ..and I stopped immediately ..realizing that my chest was still hurting and burning and my heart was racing ..and down I was really swollen and wet and tingling ..and it was very difficult to stop myself from doing it again..the urge was powerful ..

Can u people tell me what is that I experienced ?
Was it a normal sexual pleasure or an orgasm ?

I was scared to do it again ..I felt guilty after that ..I felt it was wrong ..
Is it unhealthy to do it ?
I read once that it causes a girl to get less pleasure from a partner ..

..Please tell me I would be really grateful to you ..