Should I switch to B guitar?

Well in my family, both of my sisters are amazing singers. One is 10 years old and the other is 15 and they are great! But me..... not really, at least i don't think. Being put down by a mean older sister that said i was a horrible singer a lot as a child, lead to me believing i was unable to sing and sound good. So i stopped, never sang in front of people ever again in my life, and honestly, i really love to sing. Anyway, giving up singing i moved to guitar. I got my first acoustic guitar about 7 years ago at 7 years old. It came with a DVD on how to play it. I would practice at least an hour a week and more as i got older and i took lessons in 4th and 5th grade and didn't make any progress. I'd look up songs to play on the internet and try... and fail then give up. And try again a few days later. Well that was YEARS ago and i still can't get through the Peavey beginner guitar DVD. My fingers are very calloused that's not the problem, i cant adjust all my fingers on the right strings quickly all at the same time even after hours of repetition and practice. I tried piano during that time and im OK..ish. But i don't think its for me. I also played clarinet in 6th grade for band cl and i did good on that but that's a marching band instrument that i don't enjoy. After all that, i need to play something because it feels so awkward being in a very musically inclined family and I can't really play any of the instruments i've tried. I want to be in a band someday so i think that b guitar might be the instrument for me. And don't say music just isn't my thing because i listen to it ALL THE TIME and thinking about my situation makes me want to cry. When family visits, they always listen to my sisters sing and my mom play piano or flute and my brother play saxophone or piano and my dad play drums and they ask "what do you play, Mandy?" and i get to be super embarred and say "nothing". :'( I've beem wasting my time with 7 years of guitar and no progress and i've accepted the fact that i can't play accoustic so i'm gonna move on. Would b guitar be easier for me? Should i switch or stay with accoustic guitar? Should I forget b and choose a different instrument? Please help me! I just need some answers and a lot of good advice Thanks....