It is should be larger as was mentioned in the very first reply.
The problem is that your source video is very heavily compressed. There is no way to reduce size when trimming and keep original quality except by avoiding a re-encode. And @daniel47 already mentioned how to do this above using Extract Sub-clip. So, at this point, you need to re-read everything mentioned here and stop insisting for an impossible combination of things that makes it seem like you are not reading or understanding the provided help. If you have trouble understanding, you can read more about digital video, in general, or better yet: stop looking at file size when you are dealing with such small files anyways.