Is it normal that bf wants to be there whenever i meet new employers, friends?

I have been with my bf for a year, living with him 6 months.

Since I graduated college last June, it's been hard keeping in touch with friends who moved away; I haven't been able to make any new friends b/c I am still looking for work, thus very broke and at home most of the day on the computer.

When I was still in school, if I wanted to join a club or go see a friend, my boyfriend always assumed he would go too. If I told him I wanted to go alone, he would become sad/argumentative and bring up my past crappy relationships and tell me I'm not used to being in a wholesome relationship where partners spend all their time together. And I would begin to doubt myself for wanting to go alone at all.

Inevitably though, if he came along he would be the center of attention and I would feel resentful and antisocial and not make any connections. I feel even if I didn't get uncomfortable and sulky (which I definitely did), it would still be hard to make NEW friends with him shadowing me. He's got a loud, theatrical personality and is very assertive (dominant) in conversations.

I work in a lab and the first time I met with my new PI last year, he came and dominated the meeting by showing him how to use a site that I could have easily shown....I have a job interview today and he thinks he should sit outside the office. When I said it would be weird if my interviewer saw him, he said I could explain that "my bf is just waiting and set up a wifi hotspot in the car in the meantime"... (?) He used to hang out outside my old workplace until finally my coworkers started realizing he was with me.... Why does he want my employers to know about him so much....(?)

How much of this is normal? I know couples should want to do stuff together but we are basically together 24/7. Is it feasible to make a rule that he must let me go to the first three meetings alone and after that he can join? (?) What can I say to argue that I can go alone without hurting his feelings? I am tempted to just say "f*ck it I shouldnt have to explain myself" and go alone, but I know this would be a huge problem and like I said I'm broke and living with him, and also relatively alone due to my friends moving away, and also I have royally f*cked up in my past relationships and am unsure if I am being reasonable.