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While I don't have experience with coming out, what I can tell you is that if you already know your parents are against the LGBT+ community, chances are the conversation is not going to go well. They are likely going to try to convince you that this is a phase, or that this is in your head, as mentioned by Hiraeth. I think waiting until you are ready to move out might be a better idea. It may not be so necessary right now.

However, if you are set on the idea that you must tell them, then here's what I can tell you: first you should figure things out for yourself before telling them. You said you're still questioning; there are plenty of reliable sources you can use to figure that out, but at the end of the day, only you can decide and pick a label that you are most comfortable with. Do your research and don't feel rushed or obligated to come up with a name for it. But when or if you decide that you definitely are not straight and want to tell your parents, here's what I suggest... Write a note! I think talking about it in person can be very difficult. I would write it and leave it somewhere right before you're leaving your house so your parents can read it when you're not home. If they are angry, they will have some time to let go of that anger before you come back.

Another thing is - a lot of people are against the LGBT community because of ignorance. Maybe you can educate them about it. And if it's a religious thing, I wrote an article on my blog that maybe you should show them! Here's the link.

Either way though, remember not to feel pressured. But I do believe this conversation shouldn't be had right at this moment. However, I do hope my response helps you for when the time comes, or if you want to tell your more accepting friends!

Best of luck. You are not alone, and you are very much loved. Remember that!