I live a very sedantry life style. I work in IT and play computer games as a hobby

I'm sitting down for 16 hours a day, sleep and doing the next day. I'm not overweight or unhealthy per say. 180cm / 63 kg. My died it terrible

I signed up to the gym last week wanting to have a bit of a change in my life and I started eating a bit more. Alot more (around 2700 Cal)

I figured im not going to be committed enough to keep up preparing foods and counting calories all the time. So I agreed with myself not to worry about strictly looking at calories and to have a more balanced diet just work out 3 times a week.

I know going to the gym regardless is better than what I'm doing atm which is nothing but without a surplus of calories will my muscles get "stronger"? I don't care what I look like I just want to feel better about myself and notice some sort of progression over the next year or so.

Is this possible?

Thanks