Finasteride after 13 months, hair looks worse than ever, should I stop taking it?

Finasteride is a great tool to help prevent future hair loss. It is usually not enough to reverse hair loss on its own, unless the hair loss is recent. Finasteride benefits about 40-60% of individuals who use it. It is possible that you are a part of the 40-60% of individuals who the drug is ineffective on. It is possible you are experiencing a side effect. While side effects of the drug are rare, some individuals do experience increased hair loss. 
I recommend you see a hair restoration surgeon who specializes in the medical management of hair loss. They can help you determine if finasteride is the right medication for you. Keep in mind that sense your hair loss has been progressing over time, you may need a more aggressive approach to restore your hair. Methods such as PRP therapy, laser therapy, and hair transplant surgery are all effective ways to regrow hair.

Finasteride can slow down hair loss but cannot stop in completely.  Other factors are involved.  I would suggest a careful evaluation by a hair replacement physician for diagnosis and discussion of additional options.

You really need a detailed evaluation by a hair specialist. You need to figure out if you have just one condition or in fact more than one.