Mortgage Question

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Let me start by saying I am 22 years old and looking to move out. I am very unexperienced and have been doing quite a bit of research the last couple of months and still have some questions I cannot seem to answer. The thing is I would like to buy a 4-plex or something bigger if I can afford it hopefully with an FHA loan. I would want to live in one of the apartments and have the other tenants pay my mortgage. I understand what and how I want to do it, the question I have is for the future when I want to expand and buy more investments will this be a problem since I have a mortgage. I may not be explaining this very well, but I am basically afraid of capping myself out credit wise that I will not be approved to buy more investments and that is the whole goal. If someone could give me some insight on how mortgage companies would look at this I would be very grateful. Thanks -Matt