Advice for a beginner guitarist?

So I just got my first ever guitar (a Fender Acoustic) in the mail yesterday. I played it for 4 1/2 hours straight using online guitar lessons, took a break, then played for about another 2 hours.. Then today, I played for a good 6 hours total. I learned a lot about the basic chords and strumming as well as reading tabs and understanding how to play a basic song. But the problem is, I can't play any songs! It's sooo hard to move from one chord to another fast enough.. I know that this takes time and lots of practice, but I was wondering if maybe anyone had some advice that would help me get past this slump.. It sucks because I feel like I learned so much in one day, and know I'm stuck for who knows how long just to move from one chord to another.. Should I invest in lessons? I really can't afford them right now, but if anyone that's experienced thinks they would help me more than I can myself, then I'll start saving up.. Am I doing something wrong?? Any good free online sites worth checking out? Or maybe some really easy songs I could start to practice (other than the most common ones you'll find by a simple google search)? ALL your suggestions are very veryyy much appreciated! (: