In need of some advice

So I have a boyfriend since a week or so, and everything is going pretty great. He is very kind and considerate, because I wanna take things slow. The thing is that I am noticing he is kind of losing his patience. I want to go all the way with him, but I always stop him. It’s because I never had sex and I’m kind of scared. I also want to tell him that I’m still a virgin, but I’m kind of ashamed because I’m already 25 y/o and he is more experienced than I am. Any advice on how to break the news to him 😩 I’m really worried about his reaction! Thx