i think there are a lot of things besides therapy that help. here are some things that have helped me:

adult children of alcoholics--a 12-step program for anyone from a dysfunctional family, not just an alcoholic one
journaling
inner healing classes (this is like internal family systems therapy)
soaking prayer
art journaling--which i've just started doing and am taking an amazing class
getting out and having fun and not focusing so much on my problems
volunteering and the perspective that brings

other ideas:

exercise
massage
get a spiritual director

yearning, i think it is good to ask yourself what has helped in your life and pursue more of that, or just really get honest and think about what you need rather than what you want. i'll admit that i think looking for someone to love you like a mom is probably not going to work at all. as i understand it one of the main tasks of therapy is to grieve our losses rather than to try to get the T to be who you didn't have in real life. those are two very different ways of approaching therapy and the latter really doesn't work because it is not therapy's purpose. also, i believe those sorts of mentor/mother-types of relationships work best when they happen organically rather than you trying to create them. personally, i think you might benefit a lot from a DBT class.