How can one write ones own destiny?

Q: Pranaam Gurumaa, Right now, I'm of 26 years old. I don't want to get married. I'm not against the marriage. You also say that spiritual journey has nothing to do with married life but I want to live it at my own, so that in this birth I can walk on this journey. But an astrologer told me that there are 100% chances of marriage in your life. It makes me scared. If I don't want and if marriage is in my chart, can some one's destiny still be changed. If someone doesn't want to get married, but because of karma - it can happen. Then what can I do, Please please help me with this. Gurumaa: Well, if you are a weaker person then definitely your chart analysis may speak truth for you. But who knows that astrologer is a real good astrologer or just a quack. So dont be dependent upon that persons prediction, believe in yourself & if you are strong willed person and pray to lord everyday - what ever you would want, would happen. No one can stop a warrior. So be a warrior, believe in yourself.