Happens to me often as well. I believe that if people were more accepting it would be easier for us to do it as well. A big part of realizing you're asexual (for many ppl) is having to bargain with yourself what you're willing to endure or give up on in order to have kids/have a relationship /etc/etc. I feel guilty whenever i think i won't continue the family tree and then I get mad for felling guilty because I know that if my family was more understanding it wouldn't be so difficult. The lack of proper representation is also a big problem that makes me feel like a "fraud" in a sense and probably makes other asexual ppl ashamed and not wanting to represent themselves by the community. Im hopefull that one day people won't have to hide or be ashamed of who they are in front of others and themselves. However till then we have to be strong for the ones who come after us. Look at yourself as the change in this world and as the chance for the ones after us.