I bought my 1st RV today excited but nervous

I have to wonder how much actual research the OP did before buying. Dreaming and research are two entirely different things. IF you signed a contract, not a buyer's order, then you are legally obligated depending on the verbiage in the contract and state law. Most contracts are heavily weighted in the dealer's advantage and few states allow a buyer to withdraw from a contract except under certain conditions and dealers know them well.

With the little information provided, I think the OP should beg the dealer to cancel the purchase and offer them to keep the deposit. The OP should do extensive research, rent a RV, and thoroughly consider his/her income before making suck a big purchase.