So i went to a house party with some university friends where i got talking to some 30 year old woman bare in mind i'm only 21 we talked for a bit just fluff talk then we went back to her apartment things were going well.

We started making out on her couch for a while then we moved into the bedroom made out some more i started to undress her first the breasts came out but after that nothing she then proceeded to get dressed again and started to say that i was too young for her this has been happening a lot i can get girls fairly easily i just cannot close

If anything what did i do wrong PU wise?

Wrong escalation...did you move too fast?
It's either you were too fast or you didn't turn her on before proceeding to the next level.

I thought i was going at an alright pace
it has happend before as well i start taking off the females pants and they end up getting really shy or embarassed.

seems you you didn't get her comfortable enough....either you showed body language that hinted you was nervous which in-turn made her nervous or something made her feel sluty or a like a whore...i recall one time my friend (who is overweight and not really attractive) met a girl at a club, got her to not only let him take her home but finger her in the car with me my other 2 friends and her friend in this little car. and have sex with her in a park without a condom...turns out the girl is nowhere near a slut or a freak but he just got her in a comfort zone. which you probably did but din't get her comfortable enough....my advice would to make her feel beautiful inside and out but at the same time make her feel she has to earn you...hope that helped

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"My understanding of women only goes as far as the pleasure. When it comes to the pain I'm like any other bloke - I don't want to know."-Alfie

yeah that makes sense ill put it into practice next time