Is it okay to practice Catholicism alone?

Of course you can pray and read the Bible in the meantime. When you are ready and inquirer about the RCIA program which usually begin in sept once a week till mar,apr. You will then be able to complete the Christian initiation rite of page. You interest and willingness to stay close to God in a real way will help your parents also which they may or may not want to be involved. You can encourage them to want to know there catholic faith better just by your actions. I would not encourage them in a forceful or demanding way but allow them to be able to see your heart.