How to speak spanish more fluently?

Immerse yourself in it as much as possible, make some friends who only speak spanish, and communicate. Best of luck.

Well, you have to just practice. I'm Dominican American, and during my younger 'kid' years I spoke it, but I didn't sound like I was fluent in it, you know. However, during highschool, like by the time I was 15--I started speaking more and more of it at home with my mother and grandmother, and any other opportunity that came--I spoke it! (the best I can though). I also spent like two summers in the Dominican Republic where it was the only language around, so I picked up on alot of stuff that I wouldn't have really done so in the US.

Now, I am 21 years old and I could pretty much speak it with the same flow and rhythm that my mother speaks it. Oh and I also learned to dance salsa, which is pretty awesome lol

So...my advise to you is to just continue speaking it, regardless that you may sound a little awkward, and you might feel embarrassed at times, but you're just going to have learn to eliminate all shyness at all costs. You could take Spanish classes if possible, but to be frank--in those classes you'll only get out with learning the pronunciation and grammar, and you mentioned that you'll already speak it, so I don't think that's necessary...but if you still want to anyways, to get more familiar with it, then by all means--go for it! BUT what you really have to focus on doing, is spending some time at a foreign place, where there's a lot of native Spanish speakers around. Somewhere you could travel and be able to interact with others in Spanish. You'll have many opportunities then, to watch others speak, and you might learn the way they naturally flow with their words.

So yea, sooner or later, you'll be speaking with rhythm in no time, trust me.

Pronunciation is key. Part of the problem may be that you are speaking Spanish with an American accent. It may be almost impossible to eliminate this, but you can work towards it by studying the phonetic pronunciations and diction of Spanish word. Some sounds in Spanish do not exist in English. Try learning to speak English with a Spanish dialect. This will help you isolate some of the vowel shifts and such.