:bism: (In the Name of God, the Most Beneficent, the Most Merciful)
Brother, welcome to IB!
I'm genuinely sorry to hear of your troubles, but I am happy to hear of your desire to convert. Please know that in Islam intentions are more important than actions, and therefore even if you're unable to pray or fast, then at least keep the intention and try if possible but do not sweat the stuff if you're unable to do so.
Early Muslims also had to hide their faith when they converted, and one of the things they used to do is read the Qur'an and pray in secret; so, you can do the same. It will be difficult for you, yes, but not impossible, brother.
I myself went from atheism to Islam, and therefore I know the value of Islam. So, don't let anyone or fear of any person keep you from converting because no one has the right to keep you from doing what you know is best and right for you; that said, always respect your family, especially your parents. They're just scared for you and probably afraid of what they think Islam is.
That said, just trust Allah. And keep in touch with us
InshaAllah (God-willing) on IB here so that we can offer you support and encouragement. Remember that no one can harm you or benefit you without the will of Allah and so turn to Allah for both guidance and protection in all matters of concern.
Sincere Regards & Best Wishes,