Is it ok for a guy to want to hook up with a girl that is mentally a teenager?

Stop trying to hook up. Hookups are hellish for people without intellectual disabilities; it's pretty much impossible for ID people unless they can mask their ID.

Meet people in person organically to date and pursue serious relationships instead. that way, when you do have sex, you know they'll accept and understad you.

Dating is hellish for anybody in a marginalised group due to discrimination and ignorance. for some people, it's impossible depending on their specific circumstances, such as ID people trapped under a guardianship.

but also, anyone who is obsessed or desperate for sex/romance, regardless of whether they're ID or not, will struggle to date, as desperation and obsession are instant turn offs. and it's increasingly clear you fall in this camp, hence why the Scope mods have just emailed you with a welfare check.

People don't want to navigate the issues of consent and capacity that disabled people under medical guardianship face. They'll choose people who don't have these issues.

Moreover, people seeking hookups seek discretion. They don't want anyone else to know, especially if it involves asking a third party for permission, such as the legal guardian of an ID person.

It's very unlikely you'll be able to hook up. The sooner you accept this the better off you'll be. I think the Scope mods should lock this thread to help you move forward.

Just because your therapist says you consent to sex under medical guardianship doesn't mean others want to have sex with you, nor can you make them. Everything I said before still stands.

That's lovely to hear surfygoose. Glad you both met each other and have support networks.

It's worth adding that what you have is different to what OP is looking for, as hookups are fundamentally the opposite of true love relationships. If she pivoted towards looking for deeper connections like what you have, she's more likely to find someone.