God's eventual plan for your life may not include marriage. If you do not marry there is nothing wrong with that so long as you don't see your life as being something less than it might have been if you had only met the right person. God may be calling you to remain single, so that your energies can be more fully channeled into service to Him. You may be called to the Ordained Ministry, or Religious life. No one can decide that for you, but through prayer and discernment you will learn to see that your specific gifts may be well suited for religious life.
Most young people consider religious life at some point if only for a moment.
If you would like more information you can contact the Vocations office in your diocese. They will be happy to assist you in your discernment process. Don't be afraid to make the wrong choice. So long as your life honors God, He will be pleased with your effort. Many people change careers, or take years to decide upon what it is they eventually want to do or be in their lives.