I am completely clueless

I have no idea how to start this so ima just go for it. I started dating this guy a little over four months ago. Before I met him, I dated other guys but I wasn't like sexually attracted to them at all. I am attracted to him sexually as well as like emotionally and we are incredibly connected but anyway, I used to masturbate around the time I got my first boyfriend, but I stopped because at the time I was young enough (12) and clueless enough to where I didn't really know what it was, and I didn't know anything just that it felt good and it needed to be kept secret. I started again two or three months after I started dating this guy, and recently we've gotten to a new step for me - I've been thoroughly fingered. There's two questions I don't know about this.... Then first being, the very first time he fingered me was the very first time anything other than a tampon went up there, like usually I just relied on clit stimulation...... But anyway, that night there was an almost rusty reddish color in my underwear as opposed to the normal discharge, and I'm not entirely sure what that was..... while I am definitely a virgin, I do know that the first time you have sex your "cherries pop" but I didn't think that was a thing with getting fingered the first time? I just kinda thought that was a penis only thing? So yeah.... My uhm completely sheltered mind is kinda clueless there..... Second thing: We've dry humped and I've made him cum, but then he's fingered me and he's asked if I've come and my answer is usually an "I don't know" followed by burying my face in his chest. Truthfully, I have no idea. I have no idea what it feels like, I haven't an inkling although he's asked.... Help? Explanation? I don't know who to ask, so..... Helppppppp pleeaaasssseeeeee