$60k entry-level salary

Hi I think I've got a very good chance of getting a job I applied & interviewed for, when they asked what salary I wanted I said $60k, when looking around some places are offering the range of $65k-$75k but want experience. This would be my first job in the corporate world and an entry level position, I have completed my Bachelor's and will most likely be doing my graduate diploma alongside this full time job.

So what are your thoughts, did I mess up by only asking for $60k, I may try to discuss if there are bonuses/commissions. Or should I be pretty happy if they get back to me and offer the $60k. I'm 21 and pay $200 a week rent.

The workplace upon first impression seemed young and happy, everyone was smiling and talking to each-other, felt like a place I would want to work.

edit: thanks everyone for the replies, I feel like I've definitely made a decent decision now, I'm pretty certain it will be $60k + super, and like everyone is saying, getting the first job is the main important part, from there I can gain the experience and slowly work my way up. Really appreciate it, thanks :)