First and Foremost, ask Allah, The One Who Hears how the heart feels. It is essential to make a plan of action, like consulting people on here for advice etc as you are doing BUT, you also need to add in the element of asking Allah az for His Assistance because this will be a hard journey for you. Not because Islam is difficult, but because people are...well people. Full of emotions, of opinions, of their own ways. So if you want to open up to your parents about it and you are sure, then you need to be firm in yourself. Believe in yourself and knowledge in this context is what will give you that confidence. You want to ask yourself why...do you want to tell your family so you can be free from the shackles of this world? Do you want to engage in Islam openly and perhaps lead them towards it too? Do you want to tell them just so you are 'accepted'? Prepare yourself. Have the right intentions. Follow suit with the correct action.Be patient over what comes next- it depends on how your family receives it. It matters how you feel too. Sometimes we have to make hurtful choices because if Allah, the Entirely Just, has guided you here then you know it is the next life (Jannah) over this life (Dunya) and that can be 'hard', especially when a person has completely engrossed themselves in this worldly realm. Youll be a living embodiment of what you have learnt in Islam, so if things don't start off peachy, remember your raison d'etre and stay steadfast. Life is literally a game; the best players play it beautifully. May Allah az increase you in goodness and grant you excellent guidance and may He protect you from the enemy, the devil (Shaitaan). Ameen