Is it normal to feel this way?

Ever since I was little I find I get easily attached to people that show me attention. I'm an only child, so I can't really understand why as get a lot of attention at home and in my family. When I was in nursery I had a favourite teacher (like most kids) and I got really attached to her, like she always used to give me hugs and be really nice to me, then when I moved to primary it was the same again, I wrote notes to my teacher telling her how I liked being in her class and that I don't want to leave and I cried on our last day. Then I went to secondary and first there was a teacher who I thought the world of she was really nice are caring and anytime I had a problem I went to her, she was so sweet, kind and helpful and she had to leave my school, so when she left there was another teacher, and she left to have a baby and then another teacher after that and I got attached to each of them because they gave me a lot of attention, they used to care about me and got me through my dark days. But then I had to leave school, so I got myself a job and the same thing happened with my boss, I only work in a little shop, so it's only me and her working all the time so we have time to chat on the quite days, she also cares about me, and we get along really well, and anytime I need someone to speak to she's there too, she's like a second mum to me, when I left school though I thought it would stop, I was 16 and I thought it was something I'd grow out of. Then I went to college and things have happened with another student, and my teacher has been there for me, she told me she's there for me when and if I need her and to just go and see her. and I really care about them all. I miss every one of them, but there's my boss and latest teacher that I still see regularly throughout the week and I really do care for them, and I feel as if they care for me too. I'm scared this is going to happen throughout my life as I keep getting hurt each time I have to move on, but I don't know what to do because I can't help it, I find myself feeling this way about people who act like a mum to me, they give me attention and care for me, I feel dependant on them and I don't know how to stop feeling this way! Is it weird?