I think what Sabby wrote was very good adivice.

also-- it's not talked about much but actually teen bedwetting is really quite common-- researchers estimate that about 1 in every 100 teens wet the bed(up and even through the age of 16)-- I think it's just not talked about. and since both you and your sister had this problem I would wonder if it was perhaps genetic.
wonder if anyone in your parents generation had this problem..... something to keep in mind also when/if you ever have kids.

anyway-- I think the idea of seeking counseling could be helpful. It could possibly improve low self esteem, learn to set healthy boundaries in relationships and a bunch of other good stuff.

best to you and Welcome!

fins