i get nervous when presenting with feminine characteristics

Its completely reasonable. Transgender women and gender noncomforming men are statistically the most likely to receive agressive or violent reactions for being themselves in public. I am not saying this to discourage you; I am saying this for two reasons. First, accepting that there are those in the world who will be extremely unaccepting and judgmental towards you is an important part of becoming confident and secure within yourself. The more that you make peace with that fact that encountering ignorance is a part of life the easier it will be to brush it off whenever you do.

The second reason is a bit more harsh of a reality. Members of the LGBTQ community as a whole preach about always being open and genuine about you identity, but there are times when you will want to fade into the background. There are times when playing a role and miniciking the norm is essential. I am definitely not recommending that you prevent yourself from expressing yourself in general, but it is always important to be aware of your environment and understand that there is nothing wrong with doing what is necessary to ensure your safety whenever you feel too uncomfortable, judged, or even threatened.

The overall anxiety does lessen with time though.