How to judge the quality of my own paper?
If your adviser is a coauthor, he has to agree with whether the paper is suitable for submission to a particular journal.

Otherwise, you could judge the quality of your paper by comparing it with published papers in the journal you intend to submit your paper to. However, I recommend asking for other people's opinion about the paper; this would be people you know, who have had some publication experience. 

Is there an upcoming conference which you can submit your paper to? It is a good idea to submit the paper to a conference first.