Fab - what chimchar says is true - but some people are just shit at maintaining contact, although they still love to hear from you/others.
I have a couple of friends who actually are very good friends - but if I didn't make the effort to stay in touch, I'd never hear from them from one end of the year to the next. Not because they don't like me, just because they always have stuff on and time just slides away and before you know it, it's Christmas card time again.
I know there are people who believe friends are like clothes - if you haven't worn heard from them in a certain period, then discard them - but I don't believe that. In fact, I have just had email contact from one of my Uni friends who I lost touch with about 15 years ago!
I get the feeling, and please correct me if I'm wrong, that you are trying to replace mother-love with friend-love - looking for people to fill the mother-gap. It won't work, sorry.
Only you can do that - only you can create the belief in yourself that you matter, that you are lovable, that you are important to yourself and therefore other people.
((Hugs)) to you m'dear - give your head and heart a break and leave the emailing alone for a bit.