Mental block during sex

I am currently 19m and I just got a new girlfriend we’ve been seeing each other for a little while now and we just started getting intimate.

3 years ago I got my first ever girlfriend pregnant and I had to pay for an abortion while hiding it from my parents it was one of the most stressful things I’ve ever gone through and it still effects me now.

Put simply I can’t enjoy penetrative sex I get so in my head and anxious that I’m going to get my girlfriend pregnant that I just mentally kinda check out which sucks because I do genuinely love being physical and everything leading up to sex is great.

Just looking for some advice from people who have deal with this kinda stuff?