Is it normal to not know your own sexuality?

I'm a 24 year old male. I was with a girl for about 8 years & truly loved her wanted to marry her we became pregnant and we was soo happy 5 months in something went wrong and the baby passed away. My gf got really distant with me and never wanted to talk and stayed out every night.. eventually she cheated on me and moved out with him 6 months ago.. I was crushed and shut everyone out.

Three months ago I had a few days off work so I took a trip up into Malibu California and on the beach I met this guy called Robby he is very attractive and the girls all seemed to be staring at him.. we was both new to paddle surfing and made fun of each other and joked around.. basically we clicked right away and got to talking and realized we are both from the Los feliz area and had a lot in common so we started hanging out everyday like normal dudes do.. a few days into it the topic of girls came up & he tells me he is gay.. I don't have a problem with gay people so it didn't bother me but I did admit to myself in that moment that I found him really really attractive (It's those blue eyes) and charming.

Last month there was a bad storm unusual for LA so he stayed the night with me, and this is where our relationship changed. We was joking like normal but was so very different for me, I just wanted him. We had a movie on in my room cause that's where I have the blueray hooked up and was layin on the bed together I pulled him close to me his back to me and wrapped my arm around him he didn't stop me and didn't say anything we laid like that awhile watching the movie and I got up the nerve to rub his side with my finger tips I felt him shutter so I leaned in kissing his neck softly up and down it before sucking it..He moaned and reached back running his hands through my hair and keeping me still on his neck.. I started grinding my body into his back and that's when he froze up and jumped up and looked at me like 'what the hell' I told him I wanted to be with him and he looked at me confused "Why didn't you tell me you was into guys?" and I told him I'm not.. that 'I just really like you'. But I don't know what I am.. I honestly don't. I'm okay with being gay but I only like him and not other guys and its really confusing I don't really know what it makes me... Is it normal to not know what your sexuality is?