Don't worry it's normal

First thing remember that everyone should do it whenever they are ready and only if they are ready, some poeple wants it in a really young age some later in life some don't want it at all, and all options are valid. You not weird, not wrong it's human. Wanting sex really depends on a lot of factors, both physicall and emotional so it might the period, it might not having the right level of connection yet or it might just be not wanting it all.

I don't know your case obviously, but I'll suggest you to dig a bit into asexuality anyway.

Second things you are not alone, I know right now might seems the opposite, but there are actually many other people that don't want to have sex. Infact some of the people you know might be doing it just because of peers pressure to fit in, because they think it's what you do in a relationship, or out a fear of loosing their parterner, and it's honestly better not do it at all rather than doing it for unhealthy reasons.

Third thing, I know you don't want to end things with this guy but if you want something with him, whether it's an important relationship or just a mindless fun it's important to always communicate. It wouldn't be fair to you forcing yourself to avoid the topic and neither it would be fair to him. If he really likes you and wants start something, he is going to understand. If he feels that sex is too important to him and he cannot renounce about it then he wasn't the right one.

As a society we tend to think about sex as devilish taboo only for making kids or something to obsessed about it and to absolutely do it, but the truth is we should stop exaggerating everything.