Why am I so nervous around my boyfriend?

Some people are afraid to be judged, maybe because you want the best impression on him to not feel alone.

You want to impress him. Having him see you in a positive light is very important to you, so you're afraid to make mistakes. You may be scared that if you make mistakes he may not like you anymore.

You love him, and you don't want to do anything stupid around him, because you are afraid he will leave you. You want to be perfect around him.

Maybe you just don't feel comfortable around him, see what makes you nervous and try to talk it out with him

Usually when you're around people you have feelings for, you have a natural urge to impress them. You thinking your not doing so can cause those nerves to pop up. Its completely natural

because maybe you think you might do something he might not like and he will get mad at you or something

If it is a new relationship then you could be afraid to show too much in case he disapproves and leaves. If you have low confidence or don't very highly of yourself that might be part of it too. You could have opposite views on things which makes you aware of what you should or should not say.

Perhaps there's some sort of trust issue that needs to be worked on? Talk it out with him, there's a good chance he will be able to help you understand and possibly solve this nervousness​.

The reason why you are nervous, is because this person is important to you. And as such, their thoughts actually matter to you. It's our close friends and family we care about the most therefore, their opinions matter a great deal to us. Our friends and partners are the ones we actually choose unlike family so honestly, you could argue that your friends/partner are even more important when it comes to opinions on how they view you. Remember your partner, loves you and cares about you and feels the same way. They are there to support you and grow with you together. Eventually your nervousness will fade as you grow together and become closer and stronger as you meet each others families and friends etc. You become one and find balance between both your lives, e.g your friends and her friends. You find that routine that suits both of you. Butterflies never go away with that special someone. But you do learn to trust and love unconditionally as you grow and experience together.

Perhaps this is due to not feeling 100% comfortable with them yet. It takes time, especially if the relationship is new. Spending more time together will help this. In new relationships we try very hard to seem attractive to the other person. However, the best thing to do is to relax and be yourself.