I haven't read all the replies so apologies if I'm repeating something, but I don't see bullying in any of those situations. I think that this partly has to do with your conditioning to expect bullying from people so you're seeing it where actually these are just ordinary interactions between people who don't know each other very well.
1. The first person from my group has been talking about work being boring and this job is shit. He told me not once but every day unti day 4 of my job to quit because I am too qualified for it.
Unsolicited advice maybe, but not bullying. Sounds a lot more like he is expressing his own dissatisfaction about the job. Maybe doesn't see a way out for himself but sees more hope for you because you have better qualifications. Projecting his own job dissatisfaction onto you isn't a good thing, but it's not really about you, it's about him.
2. This lady also in my group also telling me that I am too qualified for this shit job and I told her that I have applied for lots of jobs , over 250, but never accepted and I needed work. She told me not to do too much here because you are never promoted. She said she's doing this job to pay the bills.
Same as number one. In fact there is some common ground there if you look for it. You both took the job because you needed the work. You may have different hopes or expectations for it though.
These two ladies.../… invited me to have lunch with them on fourth day at work, thenwe caught the bus home together.…
In any situation you are not going to be best buddies with everyone you work with. Sometimes you find people you really click with straight away, sometimes you don't, this situation to me sounds typical of any new person in any new situation - you are sussing people out, they are sussing you out. It doesn't sound like these two women are being nasty to you, just that they maybe don't click with you socially. That's okay. Not everyone has to. As you get to know people and as they get to know you, you will find the people you do have other things in common with.
4. Met this Asian girl who is geotechnical engineer on 6th day of work. She asked what I have studied. I said I did masters in chemical and materials engineering. Her question was "what are you doing here?" I
Perfectly reasonable question given that you are actually overqualified for the job. The common ground you currently have with all these people is the job, and whatever field the job is in, it is a natural conversation starter until you've got to know people better.
5. …\…. This new guy who's done masters in geology has joined. …\… he asked why are you on this floor, you should go to level 2 to do water stuff or environmental engineering since your thesis was more related to those areas. I said that I have recently started and I don't want to run away! He said you are specialized in chemistry and should do something relating to that. I again told him that I could not find a job. He said you should've thrown more cvs. I said i did over 250 cvs but couldn't get anywhere. He said that his friend who also did geology got a job in a lab as a technicia and you are probably more qualified in chemistry than him. He then said, have you shown your cv to professionals? I said , "Yes".
Again, natural conversation. He's maybe made an assumption but there doesn't seem to be any nastiness to it, just checking that you've covered all your bases.
Attracting bullies at work
It seems more like people wanting better for you (and themselves) than bullying. Can you explain why you feel they are bullying you? If they were seeking you out and giving you a hard time maybe, but most of this honestly just sounds to me like people trying to make conversation with someone they don't know and looking for what they think will be common ground.