im dating a single mom? i think that maybe right now isnt the right time?

I'm 21 she is 24. We are both mature and have a good job. We've been dating for 4 months now. She does have a 2 year old he is a cute kid and I do love kids but I'm getting second thoughts about this relationship. We don't ever go on dates because she never makes an effort to find a babysitter so he ends up coming with us which requires a lot of attention. Don't get me wrong I love kids and treat him well, I just think it would be nice to go on a date by ourselves once or twice a month. When we are together he does get mad when we hug, cuddle, and kiss, and when we do he hits me and starts to cry. I feel like that of course he needs her more than I need her. I feel like we can't get close with each other because of this. I respect her and him and understand his needs, I do really like her and I do like him and accept him, I just feel like I can't pursue this relationship because its not going anywhere. I dont want to seem like a bad person because of this but i feel like she is more on a date with her son than me. I know she really likes me too. But it isn't going anywhere because we can't really connect. What should I do?