I need help with this

I’ve known God is real for a long time, but it’s only reverts I’ve had a deep desire to start seeking and following Christ. This past month of doing so has been hell for me. I see all these testimonials of people who say they were saved and to be saved I have to stop doing all these things. They make it sound like it was an overnight change. But when I look at all the things I know I need to stop doing it’s incredibly difficult and something that I know will time a long time to accomplish. I know I need to pray on this because I am unable to do it without the Lords help, but I’m still worried because I could die tomorrow. And if I haven’t fully submitted I won’t get to be with Jesus and this worries me. Could anyone please give insight?