Wedding vows

I’m 19 been with my boy for over 4 years now we’re not engaged or anything yet we’re waiting until we finish college, thats another 2/3 years away before we get married that’s what we both want. But for some reason I started thinking about wedding vows and I couldn’t think of anything to say, I feel like ever couple knows before there wedding what there putting in there vows and when I couldn’t think of anything I started to freak out and I had a thought like “what if you don’t love him enough” it kills me bc I love this man more than anything 😢I wouldn’t tide him for the world. But is it bad that I don’t know what I’m going to say?