Embarrassing sex moment

So me and my boyfriend are usually very active . But lately , during sex .. maybe after a 15/20 minutes into sex my vagina gets super irritated. It’s like when you rub your skin too long and it becomes irritated and a little painful and then we have to stop because I can no longer bear it .

Does anyone else experience this?

Is there anything I can do to stop?

Should I get checked out?

Help .