Why English is not my friend

Here is the rather short story of why I don't speak English well, and why I can't manage to care.
When I was a youngster (about 4) I didn't talk. I in fact, didn't actually begin talking full time until I learned to read. More about that later. I have two older sisters who magically knew what I wanted and what I was trying to communicate without having to speak, so I didn't have reason to. I could not pronounce my Rs (really, rabbit, March Thirty First) until I was about 8 or 9 years old. A lot of people thought the R thing was cute but I didn't; it was just fustrating. Now, and I've only realized this recently, I still don't actually speak English. I continually pronouce things wrong even when I know exactly how they should be pronouced, I use movie phrases when talking to my sisters to convey a feeling/mood, and then I just gesture the rest. This is all fine and dandy when talking to friends and family whom I've known for years, but attempting to talk to new people and giving speeches to groups is alarmingly difficult. I've found that people who are not used to my madness want to correct me when I pronounce something wrong, and I can't quote a movie if they haven't seen it, and I scare some people when I gesture too much. They all think I'm just crazy. Last week when I tried to give a extemporaneous speech (I made it up as I went) my hands shook the whole time, people kept asking me questions before I had a chance to explain the last, I called Texas a country and Bush a good president. It was a very bad day for me.
So back to the speaking/reading thing: I think (just a theory but who would know better than me anyway), that I didn't speak much before I began reading because as I speak I mentally spell out words in my head and I know what they look like as I say them. Thats why I can speak French exactly as well and I can read and write it. So it's a skill great for learning a new language, but awkward when I should technically have four more years of speaking experience with English than writing in English. Nevermind the writing really, I can spell and such, but deciphering my handwriting is an aquired skill. Only my sisters and crazy teachers who also have crazy handwriting can read it.