Yes, perhaps some people are more inclined to be doubters. After the resurrection, Thomas, one of Jesus' disciples, had the same facts the other disciples did, but unlike them he refused at first to believe. But when he saw Christ, his doubts vanished and he immediately exclaimed, "My Lord and my God!" (John 20:28).
Notice what changed Thomas: It wasn't his feelings, but the fact that Christ was alive and cared about him. And the same can be true for you. You see, often our faith is based only on our emotions; sometimes we feel God is near us or we feel we believe in Christ—but other times we don't feel that way. But feelings are not a reliable guide to the truth! Our feelings come and go—but the facts remain the same.
What am I saying? Simply this: Put your faith in Christ, and keep your focus on Him as He is revealed in the pages of the Bible. In other words, don't trust your feelings, but trust the facts—the fact that Christ was God in human flesh; the fact that He died on the cross for you; the fact that He rose again; the fact that He promises to save all who turn in faith to Him.
Begin by asking Christ to come into your life—and He will. Then take time every day to pray, and to read His Word, the Bible. When you do, your faith will grow and your doubts will fade.