Your answer would be that the sentence above is an example of a run-on sentence (RO).
Explanation:
The sentence above is a run-on sentence. Run-on sentences are also called fused sentences. They occur when two complete sentences are joined together without using a coordinating conjunction or proper punctuation.
In this case, I would place a comma after <em>me</em> because <em>those days were soon over for me</em> functions as an introductory clause that should be set off from the main sentence (1).
1) Those days were soon over for me, I had to get used to living as a single child.
