Am I a bitch?

I'm 27 years old and I have just started being sexually active this year.. Most of my past relationships were long distance relationships so I didn't have much experience about having a partner for sex. I lost my virginity when I was 22 years old and it was out of curiosity only. I only wanted to try sex. I used condoms that time. After that experience, I decided not to have sex without relationship.

But after 5 years of just having "self - love" , I got tired and decided to try it again. So I started dating apps and met a guy. At first we agreed only to have sex and be exclusive as sex partners. But then after the sex, I wanted more and I know he couldn't give the relationship that I want so I stopped seeing him. I didn't use condom and just had withdrawal method.. After a week, I met a guy but I just wanted to have one night stand with him so I did..

I felt bad about it after doing so. I felt like I'm dirty.. I don't know why.. I was also paranoid of getting STD.. so I stopped meeting guys..

But after three weeks, I met a new guy and we hit it off.. To make the story short, we had sex and it wasn't just once but a lot of times.. The problem was when I asked him about our status, he didn't want a relationship. I decided to stop seeing him.. During our sex, we didn't use any condoms at all..

After a two weeks of moving on, I tried to forget him by meeting a new guy (which was a mistake) .. We hit it off too and this time, he wanted a relationship just like I want too.. But the problem is I don't feel the same way for him. I like him, but not the same as the previous one.. I thought if I had sex with him, I might forget about the other guy. But the opposite happened. During our sex, all i could think of was the previous guy. I feel bad about it. Not just that, I also didn't use condom with him.

My concern is, Am i going to get STD by having those sexual partners that soon? This is probably the dumbest question. Am I also a bitch for doing so? What should I do to stop this?