Hi, I'm trying to seduce a girl who is in my college. My problem is that I'm a bit lost since she let me progress physically and progress in general, but It's very difficult for me to keep the interaction alive, cause she is very shy with me when she isnt with others. She also doesn't invest in the interactions at all, and in consequence i can keep them for a good amount of time.
My doubt is what does she feel when she is with me, i'm not sure if she has interest on me or if she is intimidates by me.
What do I have to do? Should I focus on invest in romance and comfort or it is another problem?

Maybe I need another coffee this morning, but I have no clue what you're asking here... You can't get her to invest in you?

Have you had sex with her yet? (can't tell if that's what you mean by 'progress physically') -- I would suggest that's your best bet if you're looking for investment.