Using "Smith et al" when another Smith is also referenced
If your references clearly can be traced to a unique paper then the name is not (or should not be) confusing. Yes, someone may mistake you for someone else or vice versa but then their checking of sources is out of sub-par. You can safely continue referencing the (standard) way you do it. 

If two publications exist as Smith yyyy (Smith et al. yyyy) then it is common to use letters so that the references become Smith yyyya and Smith yyyyb (Smith et al. yyyya; Smith et al. yyyyb). So not even in this case is it necessary to add initials. You may find that initials are used in older puiblications but by introducing the letters to distinguish several similar references initials have become obsolete.

It is also possible to add indicators in the text that allows the reader to understand where your work is referenced by using "we" or "I" (as the case may be) when discussing a particular reference/result, that is use an active voice instead of passive.