Uneasy feeling: How do you know if you are overextended?

[Joshua Hill]

How do you know if you are overextended? I am new to real estate investing, and I have just purchased my second property. I feel like I can cover my payments every month, however I feel uneasy about the added debt. I dont know why if I have the positive cash flow and a backup account. I guess it is just the feeling of taking on new and more loans. Is this a normal feeling to adjust to?