Separation anxiety? help!

My daughter is 6 months old and hates people, I thought it would get better as she got older and more used to people but if anything it's just gotten worse! ever since about 2 months she just screams if anyone attempts to hold her and now as she's gotten older it's gotten to the point if anyone even looks at her or talks to her that isn't me, her father and brothers she starts crying! I'm trying to get her used to her grandparents who she sees about once a week, but nothing is changing:( she's breastfed if that makes a difference? I wouldn't mind her being like this but it's upsetting to see family members get upset because they can't even look at her or talk to her without her screaming until I remove her from the situation which usually ends up with me leaving the room and being alone with her for about 10 minutes till she calms down. it's also putting a strain on our relationship because we can't leave her with anyone while we have some much needed alone time lol especially me, I haven't gone for more than 30 minutes away from her because she gets grumpy with daddy too after a while, she's just so attached to me and I don't know what to do to get her used to others :( so I was wondering if any of you have any advice?