Can A Faithful Christian Please Help Me!? I have doubts :/?

Hi guys, recently I've realized I want to embrace Jesus Christ as my savior, and follow the Holy Spirits wish. The thing is I originally was not Christian I was born Buddhist, and then was an atheist. And I feel horrible for not have believing in God. The thing is I asked a friend for proof that God exist, and he told me that the priest at his church told him that the Universe is so complex and percise, and that everything is perfect, and that if were were even a little closer to the sun or a little farther Earth would not be inhabitable, and so its crazy to say that this world just happened by luck from the big bang. The thing is I was thinking about that, and I realized something. Eventually the sun is going to explode, and we would die. And also there are galaxies headed our way which will collide and kill us. And granted none of these things will happen in the near future they are inevitable. So that has me wondering if this Universe really is not as perfect as we think. Cause there so much that could go wrong. Why would God have made it that way? I feel horrible for doubting the Holy Spirit, and Jesus, and I wish I had more Faith. Can a faithful Christian please help me with this. I wish to embrace Jesus as my savior.