Adopted, sexually attracted to my brother! help!

I was adopted & found my bio-family a year ago, including my younger brother Blaise, who's 19 & I'm 21 (I'm a female incase you couldnt tell). The first time we spoke he went outside the house where he lives in New York & told me he needed to tell me something. I could tell he sounded nervous. I asked him what & he said softly that he loves me. I knew he meant as a brother but it still creeped me out a little bit- it was our FIRST time talking to each other, ever! Time passed w/out hearing from him & then a few months later he shot me a message on FB stating that he's sorry he doesnt KIT more, he keeps to himself, that he'll always love me forever & always. We spoke on the phone again & eventually we both got Skype & we caught up on our lives growing up- our lives are black and white in comparision, nothing the same. I grew up in a stable home, he was out on the streets most of his life. We Skyped again a second time & then he cut off contact. Our sister Phylicia then told him to stop being dumb & talk to me. He finally did so & told me that I 'never have anything good to say' 'for me to find a new brother' etc. I told him I didn't feel 'that way' towards him; his response? 'shut the F up, stop talking to me' I told him when he grows up & matures, for him to then contact me, that I was cutting off contact at this point, switching the tables around. He said no. A few days later to see his reaction, I sent him a message stating that I loved him too, that wasn't it scary as heck? I saw that he saw it but I didnt receive a response. I then sent him a message about a month later wanting to work things out and he blocked me on FB messaging & ignored my FR & changed his number. About a month passed & a week ago I went up to NY to meet Phylicia & other family members & turns out he was planning on coming up to visit until he found out I was going to be there, for he then decided to stay home instead. I spoke all this over w/my older sister Rachel (adopted from a different biofam) & she asked me what I thought of him. I told her the truth- That I think he's a really hot guy but that I didnt feel anything towards him. She gave me a 'look' which made me suck in my breath. She said it was perfectly fine that I felt this way b/c we were not rasied together as brother&sister. My sister also found her bio-brother a year ago @ the same time & they too wound up having feelings for one another & went as far as acting on them eventually months later- she didnt go into specifics. I confessed that it was scary as heck & she told me that she completely understood what I was going through. She told me to just give Blaise space & that he'll come around eventually. I said that I dunno about that. Bottom line, I want Blaise in my life SO badly that it literally hurts. But at the same time, I dont know him at all, ya know? A few convo's & skype sessions wont allow me to really 'know him' and him to know me, which pisses me off b/c he's basing the fact that he knows me on the few things that have happened & that's not who I am at all. I dialed his number in my cell the other day but pressed 'end' before I actually had the courage to follow through w/calling him up. I know I need to let him go but it's the hardest thing I've ever attempted & I just cant do it. The feelings, urges, and desires I have towards him are the strongest I've ever felt and probably ever will feel, for any man on this earth. I've NEVER felt this way towards ANYONE. I know I've fallen in love with him- I know how I'm feeling is what falling in love feels like. I'm scared to death about this. How on earth do I let him go and get him to realize that I'm NOT crazy, like he himself, told me he thinks I am?!