Hello there my friend. The definition of "christian" is pretty simple in dictionary terms. You are a christian if you believe in the teachings of Jesus christ.
See pretty simple, so you don't have to sweat it there, its pretty easy to be a "christian" in the literal sense. However if you want to be a GOOD chrstian! Do not just believe the teachings but understand them. Have faith and pray. Faith is the most important part. As the bible says: " Now faith is the substance of things hoped for, the evidence of things not seen." The key word here is EVIDENCE, because strong faith is EVIDENCE of what you believe without a doubt as if it were standing right in front of you.
I have only gained faith through prayer and even pleading with God, he continues to answer my prayers and now I have no doubt about him, and many of his intentions, and this would be considered faith. The substance of my hopes for the future, the evidence that God watches out for me and those I prayer for, The beliefe that my prayers are indeed heard. Just be warned, do not force yourself to believe, or only hope to believe, do not pretend to have faith. Only pray for it and it will be granted to you in time, and not a long time.
You can not pretend faith into existance. Such as, if you were to stand under a falling rock, and were to say, I have the faith that God would protect me. If you did not believe this entirely, standing under the rock would not prove it either and you'd get smacked in the head. Faith is knowing God's will. Once you know God's will you have will have unerring confidence and faith, so keep praying, and I'll be praying for you too!