If you have faith and believe in Islam you should revert to Islam as so as possible because you don't know how long you have left in this dunya (world). If your parent are not happy with your decision and they do not want to revert too, then you will have to just keep encouraging them to convert by telling them what Islam is really about. I know some non-Muslims hate Muslims and wouldn't even want to listen to the truth. If this is the case then you should just revert by reciting the Shahadah which is the first pillar of Islam and states “there is no god but Allah, and Muhammad is the messenger of Allah”
لَا إِلٰهَ إِلَّا الله مُحَمَّدٌ رَسُولُ الله
lā ʾilāha ʾillā-llāh, muhammadun rasūlu-llāh
Allah has told us many times that we should obey our parents and keep them happy. However, we have also been told we should not do as we are told if it is against Islam.
We have enjoined on man kindness to parents: but if they (either of them) strive (to force) thee to join with Me (in worship) anything of which thou hast no knowledge, obey them not. Ye have (all) to return to me, and I will tell you (the truth) of all that ye did. (Qur'an: Surah 29, Verse 8)
Each person will have to speak for themselves on the day of judgement and if you have been blessed and guided on the right path yet you do not revert because of your family, this will be regarded as a sin. However if your parents decide to revert too, then you will be rewarded more.
My advice to you would be that you should try to get yourself at a Mosque as soon as possible. There will be an Imam who will be happy to give you advice and help you revert. There is no need to worry, you will get all the support you need.