Visitor Visa - B2

Hi all,

I gave my interview for B2 visitor visa today along with my parents at the Hyderabad consulate. My dad is retired and my mom is still working. Mine was rejected quoting 214(b) while both my parents’ visas were approved. I would like to apply again and would really appreciate any thoughts on what the reasons could have been for my rejection, so that I can improve on that.

Here is my profile:
I’m a technology specialist working in xxx company. It’s a agriculture company. In my DS 160, I said I would fund my visit myself. I thought this would be better as I’m working here. My parents DS 160s said my elder sister will fund their trip. My dad is a retiree and my mom is a government employee. My elder sister is working on H1b visa in an American technology company in the US. My younger brother is on his F1 visa, also in US.

VO: Good morning.
Us: Good morning.
VO: What is the purpose of your visit?
Dad and I: tourism
Dad: We want to see the place.
VO: Who is there in the US?
My dad: My daughter...(he was about to continue saying about my brother who is on F1 visa but he didn’t get a chance because the VO immediately asked for my sister’s visa copy)
We give my sister’s H1b visa’s copy.
VO: (looking at me) where do you work?
Me: xxx company
VO: what is your designation.?
Me: I work as a technology specialist.
VO: (to me) what is your annual income?
Me: it’s 7.6 lakhs per annum
VO: (to us) how long are you planning to stay?
Dad: (indicating mom and himself) we are planning to stay for a month. I was going to say about myself when the VO quickly asked.
VO: what about you? (to me)
Me: I’m planning to stay for 2 weeks because I don’t have much vacation and I have to return for my work.
VO: (to us) Is this your first time to the US?
Dad: Yes this is our first time.
VO: (to us) Have you been to other countries?
Dad: This is the first time for us.
VO: (to me) What about you? Which countries have you traveled?
Me: I have to the Netherlands, Germany and Belgium. (I have a 5 years Schengen Visa)
VO: (to me) What was the purpose of your trip?
Me: It was an official trip.
VO: (to me) Did you travel to Belgium while you were in the Netherlands?
Me: Yes.
VO: (to me) As a tourist?
Me: Yes, as a tourist.

My parents visas were approved while mine was rejected with a 214(b). Please share any thoughts as what could be the reason.
We are at a loss as what could be the reason... The VO didn’t ask for any document other than my sister’s visa.

Please help!

Thanks in advance.