Welcome to the Empath Community! Most people who have been diagnosed with illnesses, whether they be mental or physical, is a result of the world we live in that isn't geared towards people who are extra sensitive or, in my own words, "special." That is the main reason why you may feel like there is something "different" about you (the lack of sensitivity in the exterior world).
But don't fret! It is normal and human to have a multitude of emotions Just feel them and accept them and they will pass, just like events in life. Holding onto them, thinking there is something wrong with being empathic or sensitive, only keeps them inside you and becomes hard to let them go.
Please know this: It is a blessing to be who you are. Embrace your uniqueness. And kudos to you for figuring yourself out at 19! I didn't until just recently at 34!
Hang in there, stick around this community and with others who are kind and compassionate like you, and remember that you can still be a strong, self-assured woman with roller-coaster emotions