Not being able to go hard

2 Nights ago I went to a girls house and I've been speaking to her for ages and we have strong feelings for eachother. We started off kissing and touching and I couldn't get hard it was so embarrassing so i went to her toilet and asked her to wait a minute and so tried masturbating to get myself hard and it wouldn't work. I was so nervous and she tried giving me oral with her mouth but I couldn't get hard at all I was on flaccid the whole time. Was so angry with myself. Hopefully next time