I was exactly the same way. I was home with my daughter for 5 months before I had to go back to work, and those were the longest of my life. I love my daughter and she was, for the most part, a very good baby. I was just lonely.
I did all kinds of crazy things to get out and around people. Went shopping and chatted up people at the store, went to a playground (this is with the 2 month old who was born in November, and I live in Jersey, not Florida). I joined MOMS club, which was mostly moms of toddlers and preschoolers, and went to "playdates" for older children, just to have people to talk to. I also posted on my daughter's birth board on pregnancy.org, and those girls were nice to 'talk' to as well.
I thought I had baby blues or mild PPD, I was so lonely and sad about being all alone. (And let's face it, until about 5-6 months, they're not exactly what you'd call companionable. They're beautiful and fun, but they're newborns!) I never resented my husband (or my daughter, really) but I probably drove him nuts every day when he got home and all I wanted to do was go somewhere again. When I went back to work, that funk just up and lifted. You can be a great mom and be a working mom, who loves to be around people and be fulfilled by being out in the world. I'd say find a group, even if you don't quite belong in it with such a young child, and do as much stuff "for you" as you can. And hang in there. Oh, and when someone asks me if I miss those days when I was home with her, I honestly say, "Nope, now is better." Good luck.