I just made a huge mistake guys. So back story: I never 'came'

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I just made a huge mistake guys.

So back story: I never 'came' with a girl... I had sex sort of twice but it always sucker and I didn't feel any pleasure at all,

An older women from China (I'm from the Netherlands) was staying at my home with couchsurfing. Before she said if I'm interested, I can have fun with her.

At first I wasn't. But during the night I got so curious I visited her and we had sex and I think I came within a minute x).

Now. There is a 17 y.o. Christian girl from Ukraine that really likes me and wants to get married. I told her I wasn't sure yet until we met. This was a year ago, but we haven't had the opportunity to meet yet.
Now during this time I had 2 women and 2 times feeling horrible towards her afterwards, thinking about her when it was already too late.

Now, how can I ever face her, or even myself, seriously again? Obviously I failed her, but I also failed myself because... I am not like this. I don't know why I allowed myself to get into this mess in the first place. I guess guys are just stupid animals indeed?

So, how do you people look in this situation? Should I say bye to the girl who loves me? Am I a worthless piece of shit? How should I even be able to cope with this?