I've got college on my mind...and its not being nice.

So im thinking about college....nothing new. I mean, I think about college like 24/7. and scholarships and where im going to go. Its frustrating. I know that there are many possibilities to what I can do. My grades arent terrible (I actually make very decent grades) and im a very good student and a nice person. Burt sometimes when I think about the future, it scares me. What if what i planned doesnt work out like I wanted it to? What if I never go to college? What if when im in college, im not happy at all and I drop out or something because im not as smart as I thought I was? I dont know...Its senior year and im starting to feel pressured. A few years ago I had everything planned out. I was going to go to Michigan State for psychology (My first choice was to go directly to a college in London but that'll be very expensive), study abroad in London or somewhere in Europe, go to Graduate school to get a PhD, then after, go to London to study at Le Cordon Bleu, start a diner, then stay in London and buy a cute studio and live the rest of my life travelling the world and experiencing cultures. Right now, I dont even have the slightest of hope that any of that will happen. And now im thinking about going to Florida for....get this....Forensic Analysis! where the heck did that come from?! I know people say this is normal. They say that alot of people dont know what they want to do till theyre actually in college, but im determined to not be one of those people. I like planning and having a plan. I absolutely hate when plans change but I adjust. I think a lot of this pressure is also from my mom. If she would just stop telling people my smallest decisions then I would be ok. At first she was telling everyone I want to go to Michigan, Now shes telling everyone about Florida and making me feel like i HAVE to go there now because if I dont, people are going to think im an immature girl who cant make up her mind! I dont know what to do...I guess im going to hang in there and see how this goes.