Whats my problem??

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OK here is the deal. I already own one rent house in my home town [Rural West Texas]. I have owned it for about 9 mths. I want to buy another one for about 21k about 3k in repairs and it will bring 400 a month. I do not understand it but I keep having major anxiety about just doing it. I have already passed up several in this range just because of fear. I am not sure what I am asking for here?? Why am I so stressed over 21 thousand dollars? I will go down and and shell out more for a new car and not think a thing about it. My wife says I crazy . Does any one else have these self doubts? : :crazed: