I was similar to you, where I had little to no faith from childhood. I was called many times throughout my life, but only partially answered. Given where I am now, partial answers rather than a full effort were the biggest mistakes I ever made. Don't make the same mistakes I did. Go full on toward God and sustain it. It is the most important thing you can do in your life. He will answer if you keep at it.
Start praying. Do it every day. Don't stop. No matter how hard it is, don't stop. Take the time and do it right. I recommend saying the rosary with meditation, though you may need to build up to that.
Beg forgiveness for and eliminate sin from your life, particularly mortal sin. Below is an examination of conscience to examine mortal sins in your life.
http://archive.fatima.org/essentials/requests/examconc.asp
Start watching Youtube videos and reading to learn the faith. Go to God. The two sources I'd recommend are the Sensus Fidelium channel, particularly those from Father Ripperger, on Youtube and the long Fulton Sheen catechism series.
Sensus Fidelium
https://www.youtube.com/user/onearmsteve4192/videos
Fulton Sheen
https://www.youtube.com/watch?v=_rumiGyn0Xs&list=PLLEpVo8x_WwCqds-BBtj4sZBz5Ca5Bwts
God calls everyone, though demons can block your ability to properly hear / act on it. Fight through. When you pray, eliminate sins and work to go to God, he will answer.
I repeat, this is the most important thing you can do in your life. Fight through and get there. Don't bother listening to protestants, fight through to traditional Catholic life.