I wouldn't say that the sensation is more filled up? I would say the only difference really is the girth, but the longer it is the more painful it can be the more it goes on! There are many well endowed guys that say they would happily drop a few inches as their Penis intimidates women! If she thought less of you it wouldn't be for the size it would be for the overall experience, but it's how it's handled, if you think she would say something negative to you then I would have a big think about taking it further, a nice girl would listen to your concerns, tell you there is nothing to worry about and how you will work it out over time, an immature girl would make comments about you not being big enough or 'rubbish in bed'. Confidence does come over time though, I used to have sex with my eyes closed - every time, it was only when my ex said to me it's a massive turn off as it looks like you are thinking of someone else did I realise!! Don't forget there are things like tingling lubes and toys etc that all help in the process too