I don’t get it. She happens to have small hands so you are assuming your penis won’t fit into the space in her body that’s evolutionarily designed to accept a penis? And you haven’t even tried to have sex with her? This reeks like a misdirection brag thread.
In the event that it isn’t, why don’t you try it out with a lot of arousal and lube before you decide you’re too big to have sex with her? Speaking from experience, at your current size, length is more likely to be the issue, and you’ll have to be especially careful if she has a shallow cervix. Anecdotally, the woman with the tightest vagina I’ve experienced (and the only one too tight to be truly pleasurable for either of us) was not the shortest and did not have the smallest hands. But again, it comes off like you’re just tooting your own horn as opposed to legitimately experiencing anxiety over this.