Why do y'all think people don't use condoms

I don't understand why people don't use condoms when it prevents pregnancy and stds. I am 20 years in college and I just recently got sexually active and I'm not on birth control however every time I have sex I make the guys wears a condom and or I bring my own condoms. I rather be protected with a condom than have unprotected sex. What's better than safe sex. I rather have safe sex with a condom than have unprotected sex and end up pregnant