So it looks like, from what you said, dating apps are out and irl seems like it may be out as well. Correct if me if im wrong on that last part. If thats the case, your best bet would seem to be to look here, or on reddit. If here, it may help to post your state, and see who lives nearby. Although im sure a lot of people may avoid volunteering in order to not be labeled a creep.
You could also try a website like fetlife. Its kind of a dating app/forum for people in the kink community. The reason i recommend this, is because people in the kink/bdsm community are usually more empathetic, place a higher value on consent, and try to keep eachother safe. Plus there is an emphasis on aftercare. Although it does attract predators as well, you can usually ask around about a person to see of anyone reported them of wrongdoing, and there are ways to weed out the bad actors by getting to know them. Although, as with everything, theres no way to 100% certain. Also, if irl isnt out of the question there are meetups you could attend as well. If you want help trying to find one, just lmk.
Either way, please be safe. Dont expect your first time to be great. Especially as a girl, the first time can be painful so you may need to do it more than once if youre comfortable. If you want more information, or just somebody to talk to, feel free to ask me here or message me. I wish you the best of luck and hope you stay safe. Also, try to have fun, because the more relaxed you are the better it will be.
Edit:spelling