I think like our movements are out of rhythm and there isn’t enough foreplay to get me mentally stimulated as she is kind of jump to sex. But not sure how to approach this awkward conversation.
A big component of a healthy sexual relationship is communication. If you're uncomfortable talking to your partner about what feels good and helps you climax then you're likely going to continue having issues. You should ultimately be able to talk about these things not in the moment, but if you're not cool with that initially, talk dirty to her. Make it a thing. Surely you know what you like, so share that with her.
Also this is the first time I’m sleeping with a women over the age of 25 and maybe things don’t feel as tight as people get older.

Come on, dude. This is pretty ageist, just throwing that out there. It's a muscle, as long as you use it doesn't get loose.
Also, you're my age. Have you ever stopped to think about why you've previously only been interested in women in their early to mid 20s? As a dude going through his final month of their 30s, I can't imagine having a whole lot in common with women 15 years younger than me.
Trying to figure it out, out of a dozen+ times of sex I’ve only finished twice and was pretty tough to get there. I like this gal and don’t want to make waves but this is something I need to work out if there’s long term potential. It’s just an unfortunate and awkward conversation to have in the early months of dating…
Sounds like a lot mental stuff, I've had this happen and once I stop overthinking things it's fine again. And probably lay off on jerking off as you get used to a routine and rhythm.