Sex is painful

Sara • Had my first period at 12 years old, I've been sexually active since I was 15.
My partner and I have been together for almost 4 years. However every time we have sex (with high quality lubricant) I always end up sore, raw, and sometimes bleeding from it. Bleeding is not due to period, fyi. Is it that he's too big or I'm too small? Or both? Any ideas?