For me, my girlfriend was a perfect fit so being with her was really easy. Telling everyone about being Bi was really easy because my feelings about her were really obvious to me. It surprised me that she felt insecure about me not actually being into girls or just experimenting. She told me she was totally okay with me experimenting but I was so surprised when she said that because I liked her and that was that. It surprised her because how comfortable I was with being Bi and being open to my friends about it.
I can totally relate to it being thrilling, sexy, and scary because I totally surprised myself on how much I was into this girl. I'm 21 and I have been in long term relationships back to back for 7 years up until the beginning of this year. I was bicurious/unsure since I was 13 because I was always in committed relationships with men and I didn't have the chance to really explore that side of myself. I met my girlfriend last October and we were drawn to each other like magnets. It blew my mind on how well we got along because I'm mostly friends with dudes, not girls. I was pretty stoked and we quickly became best friends. I was still "straight" at the time but I remember when I first found out she was gay and I immediately thought "I'd totally hook up with her". It wasn't the first time I thought about girls in that way at that point, but it still blew my mind. After hanging out once, we saw each other every weekend, and then later on almost every day. She's my other half. I love her so much haha.
I totally understand about being afraid about cultural issues. I'm asian too. I've always known that I'd be serious about this girl since we first started hanging out. I knew I could never deny I liked her so to me, there is a serious possibility about having a talk with my parents about her and about me liking girls. It's interesting because my girlfriend doesn't quite see it that way because she's a lesbian so she will be having that talk 100% and for me, she thinks that I probably will be fine and I don't have to worry because I still have a "chance" at normalcy. It's just different perspectives haha. Up until a few months ago I did not even consider what it would be like to marry a girl. How are my relatives going to react and are they even going to come to my wedding? I honestly have NO idea. All I know is that I'm happy and that is what's most important to me.
TL;DR - What made this whole amazing roller coaster ride better was that I committed to being honest with myself 100%.