First girlfriend

So I’ve been in a relationship with my first ever girlfriend for around 3 months. She’s a perfect match, and we’re so similar and have so much in common. We spend so much time together and hardly ever argue until recently, now that we’ve passed the first few months and are starting to more deeply connect with each other. But her past is a constant bother to me, and it’s making me consider ending the relationship before it’s really begun. For context, I’d hardly ever spoken to anyone romantically and hadn’t done anything more than hold hands. However, she’s been my first everything, and apart from having sex, I wasn’t her first anything. It bugs me more because the first time we spoke, I told her my boundaries, and I said how I didn’t want someone with much experience before me because of my lack of experience. And she told me she hadn’t spoken to many guys (she initially said around 4-5 and they hadn’t gone anywhere apart from a 1 1/2 month relationship over a year ago), and then she’d only kissed 2 but nothing more. Then, as time’s gone on, her friends and she have told me more and more, turning out she’s spoken to around 20 (each lasting 2 or more weeks). She’s kissed/made out with over 10 and has also given and received oral sex (something she explicitly said she had never done before). And I’m at a crossroads because I’ve had problems with this before, and we worked it out and moved past it, but I keep getting told more and more. I explicitly told her before we were together that too much experience was a deal breaker, and I wouldn’t want a relationship if so. But due to a pretty lengthy stay in hospital and various issues at home over the last year, my social circle has shrunk massively to only around 3 people including her; otherwise, I’d break up and be honest with her. But in addition, we do get along really really well, and I do love her, but the thought of her past makes me feel so insecure, unattractive towards her, and angry/depressed at myself. I’m only 17, so I’m aware it isn’t anything serious, and I am very inexperienced with relationships, but I don’t want to lose her. But being with her makes me feel worse about myself, and I want to work it out at least until I get back on my feet socially, but I feel so terrible either way.