You're afraid she'll be noticing the little things about you, from your physical features to the way you act around her. But if she really cares about you, she'll embrace everything that makes you, well, you! If you're nervous, you're probably scared something bad will happen between you two or the relationship, or your self-confidence and self-esteem may be low. Go ahead and talk to her if your nervousness affects your relationship in a negative way. If she cares about you, she'll understand and you'll have no reason to be nervous around her anymore. There are many reasons you could feel nervous around your girlfriend. A lot of it may relate to a sense of being judged -Are you good enough for her?- Does she love you as much as you love her?- Have you had much experience in dating relationships (new experiences can contribute to anxiety)- Are you feeling pushed by other people such as friends and family to like her or to enter into a longer term relationship and maybe marriage?. However these are just some possible reasons and if your relationship has healthy foundations or you would like to build them, then I would hope you could both talk about this and that might go some way to addressing your concerns. It may be because your girlfriend/boyfriend is someone you care about what they think of you, and you might be feeling like you want to be "perfect". It could also be that you have strong feelings for this person! Whatever it is, take a deep breath, remember she/he also wants to be accepted and may be nervous in some degree too. Try to build trust little by little sharing details about your day, your life, thoughts, etc. You could also lightly tell them something like " I still get a little nervous around you :)". Finally, it is norm to feel nervous around your significant other, specially when the relationship is new, but this doesn't mean it is a bad thing, or that you can't express or open up to her/him (in fact, the opposite is what might help you the most to get more comfortable!)