How do I open up to my girlfriend and tell her that there’s something wrong with me?

Anonymous
Me and girlfriend is getting to the point now where she thinks we’re ready to start having sex but I have a problem that she doesn’t know about, I can’t stay hard during sex. I’ve hard sex 2 times before with 2 different women and on both accessions I was only able to stay hard for a few minutes then I got soft and couldn’t get hard again no matter how much I tried and I’m only 25 years old

I don’t know how to tell my girlfriend about this problem and I’m scared she’s going to leave me if I tell her and loose her respect for me and honestly I don’t want to loose her

can you guys please give me advice
How do I open up to my girlfriend and tell her that there’s something wrong with me?
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