You were used and disacrded like a condom. It would be stanger if you felt something.
That said, rather than walling off others, learn to read the true intentions of others because you will eventually be in situations you have to deal or even rely on others like work, receiving services or negotiating terms. Unless you plan to be a brilliant scientist with robots doing everything for you or live out in the wildnerness as a wild human, it is impossible to live in modern society without relying on others every once in a while, even if you can do many things behind a screen