Sounds like you are having some issues with perfectionistic thinking. This can be contributed to by a habit of being overly focused on external indicators of your value/performance.

My thought is, worry about it once it becomes relevant! There's nothing wrong with being a virgin at any age, and no matter when you end up having a first experience, there never becomes a point where you are "branded for life" or anything like that. It is also a common experience to worry about performance, so you are definitely not alone. Sex is supposed to be a fun and enjoyable thing! It feels best when it is natural. So practice being natural in your life right now, and living in the moment. Try to take a step back from how you are coming off to people or what people may be thinking about you, and just see what happens if you act spontaneous. Be gentle with yourself sand try to have fun! Always remember that you have intrinsic value that cannot be measured with numbers and facts.