What should I do to give credit to an author whose first name is the same as mine and last name is not provided anywhere? I don't want it to look like I wrote the article which I am citing in any way, shape, or form, but I also don't want to make a big deal out of that one citation. I am using MLA formatting.
If it's just the first name, cite the work as being authored by a mononymic person. Author names in text are virtually always (a) full name, (b) initials + last name, or (c) just last name.
The consistent use of a first name only, along with an entry in the works cited whose author has that name and that name alone, will make it clear that you are a different person (especially if you actually do quote yourself and have a separate entry, in Last, First format with your works).
If you still feel that there is the possibility for confusion, upon first mention of the author, insert a footnote or parenthetical statement to clarify the distinction.