yeah, definitely do it and don't put it off. I wish I had told my own mother about some of this stuff when I was young, but like you, I had some resentment because she walked away from all 5 of us kids when I was just three. Never had any sort of relationship with her outside of rarely seeing her, the others did spend some time with her, but I still held onto some resentment. When I was just starting college though, she was killed by a drunk driver on her way home from work, so therein lies some regret that I didn't put some effort into it as my siblings did.