Is this normal?

Hi, I am a 20yo male, the past week I went out with a girl, and then we went back to my house. It was the first time I had a girl I liked in my bed. After a couple of hours of netflix and holding hands and stuff I went in to kiss her. It was the first time I kissed a girl (There was another time where I kissed a girl at a party, but I didn't like her so I wasn't as nervous and it didn't feel good at all, so I don't really count it). Because it was my first actual time kissing, and for about an hour I was thinking about it. When I kissed her, after about 2 minutes of making out and grinding, I got so excited and ejaculated (yes, in my pants...). I thought it was just because of excitment and the built up tension. I made some excuse to go clean up, but after that we continued and it was less fun then before the incident.

A couple of days later she came to my place and again, after a couple of hours we started making out and dry humping, it was really good and pretty aggressive, but after about 10 minutes, again I ejaculated, I ignored it and continued, after about 15 more minutes it happend again.

I have a couple of questions.

First, has this happend to anyone else? What did you do? Did you talk with your partner about it? How did she react?

Second, is it normal to have that happen only when making out + dry humping?

Third, should I be worried or is it because I am so inexperienced?

Lastly, does any one have any tips so it dosen't happen?

Thank you very much