upset because my gf is scared to have sex M20 F19 how do i stop feeling this way?

for context: Been dating my girlfriend for almost a year and we're LDR, we are still both virgins and we planned to have sex on our anniversary day but sometimes when i mention about it she randomly says can we do it in a couple years or after marriage we've done foreplay and making out multiple times but not penetration.

when i started feeling upset when she said that she just insisted we could do foreplay and stuff, how do i stop being upset over it?