If that's your attitude, probably not cut out for founding.
Actually re-reading your comment I'm still not sure what you mean? If you're not willing to sacrifice relationships to start a company, then you're not cut out for founding? Isn't that a pretty unhealthy position to take in life?
The potential to sacrifice relationships is the complete wrong way to look at it. Investing is not only opportunistic, it can help someone realize a dream.
Correct, if these are your first thoughts, you are going to struggle mightily as a founder.