The answer depends on your belief system.
What if the curses are actually coming from yourself? You make them happen, rather than get them from someone cursing you?
I believe in positive thinking. That gotta makes a believer in negative thinking as well, right? Well, someone who's totally into negative thinking can look like he/she's cursed. But the bad things happening to that person might just come from his/her incredible amount of negative thoughts.
Does that make sense?
Both make sense^^^ from the psychological end.
If it is believed that one is cursed then what often happens is a deepening of the
obsession of that certain belief and it can become more and more negative by nature.
This is the usual process of psychology and it can become quite personal,
the one whom believes they are 'cursed' will usually over develop a defense mechanism
that can trigger an overly negative view point.
I have helped in these areas by asking the individual to make a double list, two columns, same page.
Left side..List everything that is positive about their self and Right side, a list that is what they feel is
negative about their self. Place these right next to one another and see if the positives can
outweigh the negatives, to see if a connection can be made by drawing a line from the positive
to the negative. One which will outweigh the other. Positivity seems to always overrule negativity.
It's a great tool to use and it works if it's used as a personal checkpoint
and to keep with it every day.