Am answering you because I'm obligated to do so. YES I was chosen for salvation before the foundation of the world, and YES I heard about God's grace "somewhere" and YES the Holly spirit convicted my heart in this matter allowing me to accept Christ, and further allowing me accept, understand and believe the quote you have there from 1 John.
If you have some other way you came to Christ then great. If you simply believe and are saved for that without God doing so for you then have at it.
I am not, nor was not, able to come to Christ on my own, by my choice. I had absolutely no desire for Christ or God at one point in my life. I did not choose to be a Christian and why on earth God wants me I have no idea.
I'm not full of pride over being chosen, nor do I think I belong to an exclusive club of any kind. I can't count the people chosen, but like them, I simply saw myself for what I was and accepted Gods grace for what he wanted and wants for me to be.
My theology is not based on a man named John Calvin. I did not discover John Calvin until years after I became a Christian. When I did, it was more like; "
Cool! this old guy wrote about what I know years ago. Hum John Calvin...how about that?" Then I started reading about other old dead guys and finding out they also wrote about what I know. Fascinating.....then I started going to a church.