Dont give up because of what other people tell you. Im not sure if anyone criticized you or anything :p but dont feel down if someone does. There are billions of people in the world, many wont like your work but there are surely some who will like it. Its impossible to be loved by all, what you should care is not the ones who dont like your work, but the ones who like it.
You are the master of your own stories and responsible for their progression and conclusion. So, end it if you think its time to end it and continue if you think there is still story to be told.
Your story has just started, so I think there should be a lot left to write about, but the decision is yours...
Anyway, dont be like me who starts writing and gets too lazy to finish :p
If you are going to finish it, make a proper end ;)