is this normal in a relationship?

I feel almost sad typing this. My boyfriend and I have been dating for over 10 months now. He’s my first long term, I’m 20 and he’s 19. I know we’re young but I love him so unbelievably much. He is good for me - he makes me feel beautiful, wanted, and special every day. I still have insecurities and let them get to my head sometimes... like maybe he’s falling out of love with me. convince myself he’s Losing interest in me when he assures me all the time he’s not. He says he’ll always try to work things out with me if he feels anything go wrong and often references a future with me, which feels amazing when he does cause I would love to spend the rest of my life with him. I guess I’m always hesitant though because I don’t see how anyone could love me for their whole life. I’m nothing special, at least I don’t think I am, and he is definitely out of my league and could have pretty much anyone he wants. I feel like I don’t allow myself to be 100% happy and content with him because I have the constant fear of losing him... right now, he’s really all I have.

Anyways, our honeymoon phase lasted a long time. Like 6 or 7 months, which is crazy cause I hear it’s averaged 3 months. We spend LOTS of time together which is great, but lately he gets on my nerves. We bicker. And I hate doing it because I don’t want to jeopardize what we have. We agreed to spend a little less time together, which I can’t tell if that was a healthy decision or not? Was it? Is it normal to bicker and to be annoyed with him sometimes? Does our relationship seem healthy? Idk, I just want some opinions/advice because I’d really love to take this to the end with him. I want to maintain this because I don’t know how I could ever love someone else.