Are there any steps that I can take to get over these feelings? I'm miserable because she's one of the only people that I can REALLY talk to about anything and everything.
Raise your self esteem, that will help.

I'm the same, I was treated as scapegoat/burden by my parents. Its hard to rid of the feeling of how UNimportant nuture has made you feel.
My boss said to me recently that in all the time I've worked there (8 years) I'm the only one who has NEVER bothered him or complained about anything.

I just 'suck it up' assuming like mother told me 'No one cares about YOU no one wants to listen to your drivel'

Gee thanks mommy dearest.

I'm not so bad now, I have worked hard on my self esteem. I've started to commicate more with my boss and he is pleased!

I'm sure your good friend is happy to hear from you. And don't forget, I'm sure you would support and listen to her if she needed it. I dont think a daily text will annoy.
Most people like to feel helpful and wanted remember.