Is this wierd?!?! (Relationship advice)?

Okay I went to my friend's house and met her brother for the first time. Well it was weird like the 1st time I looked into his eyes I knew I liked him and I could tell he felt it to. After that day his sister and I went skating. Well my grandmother was late getting there but my friends mom and brother were already there so they waited with me. I had on a short sleeve shirt. He could tell I was getting cold so he offered me his jacket. I was about to answer when my grandmother arrived so i said no its okay there's my grandmother. Well I had gotten his cell number so i texted him and after awhile he said are you single and i was like yea and then he asked me if i liked his friend and i was like ewww no and then he said well do you like me and i was like why do you want to kno >_> and then he said will you go out with me and i was like Yes. Also he is 1 year and 10 months older than me. I was wanting to kno if it is wierd that I am dating him and about knowing he liked me from looking at him and do you think our relationship will last? PLEASE HELP! But if this helps n e my friend said she didnt care if i liked him ...