Getting wet ?!

Hey guys,
so me and my boyfriend are together for 5 months now. We have a LDR and (only) see each other like twice a month. (In March/April we didnt see each other for 6 weeks, because i have been on a backpacking trip.). He is my First bf and the first one i've slept with. (I am 18 and he is 23 btw). He has had a couple of other girls before me. 
So... we only had Sex 3 Times now and i'm a real newbie so i have No idea what i am doing. Problem is, after the 8 week sexbreak we tried to have sex yesterday, but i couldnt really get wet so we had problems with getting his D (which is, by my opinion, huge btw) in. So after the second time, we just stopped trying. 
After that, we talked about it (because i think it's very Important to Talk about Stuff like that). I told him, that i (think i) need longer foreplay and asked if that unusual for him. He said, that his ex-gfs all got wet very quickly, so they didnt Need any foreplay. And the fact, that i do need that really got to him. I think that really scratched his ego (especially because he already has huge issues with himself... selfworth, selfconfidence causing or caused by depression). I really feel bad, because he thinks, it's his fault. It's definitely not! For me, he is the Most attractive man in the world and he really is such a hottie. (I am horny like all the time and even little touches make me want to jump that guy 😅) 
I think, i just need a little More Time before. (I also think, i am really tense in the beginning, because this stuff is so new for me. So i cant really enjoy the moment, but do think too much. Maybe thats why i don't get wet so quickly? I don't know 😥) 
Has anyone of you experienced similar situations and what can i do, the next time we try? 
Maybe lube is an option? 
I hope you guys can help me. Thanks already!