I feel like I'm going to get this all out at the wrong time
Why do you need to do it now then?
I hate not being able to talk about what I want to say
I think that there are better ways to address this. You should wait until the right time so that it does not stress anyone out.
I can't wait, I don't understand why I should and I need my space.
You should try to remain cool and collected. Facing your problems bravely is the only solution. You definitely should not be emotionally suffocated with your thoughts but you should deal with them in a proper way.