It depends on your DH's temperament and job but don't assume that he's larking about all day.
It's not a case of assuming he is larking about all day. It's knowing that he is driving in his car, listening to the radio, sipping his nice coffee, allowed to focus uninterrupted on the task at hand - driving.
It's knowing that when he is at work he will most likely experience a toilet break fairly close to the time he needs one, that doesn't involve other people banging at the door or crying for him, or worse, that specific silence that all parents dread.
It's knowing that he will be spoken to in his first language, never have to have a frustrating, circular conversation with someone who is insisting on taking off their shoes in the park in mid-December, or sitting down on the footpath and refusing to budge on the way back from the supermarket, who may well run away and out on a busy street if you take your eyes off them, and instead speak in English with people who are capable of a reasonable and rational discussion (at least compared to your average two year old they are...)
When you are at home with a baby and toddler even your thoughts are constantly interrupted. While constantly on the alert for them, constantly listening to their chatter, crying, signals of being tired, hungry, frustrated, up to mischief, etc, you end up with your headspace completely occupied. They love you and they depend on you for everything, but they have no concept of respect for your personal space, your time, your energy, and the idea that you have needs is not one that has ever crossed their minds. They have no 'off' switch so you are 'on' All.The.Time.
It can be maddening, infuriating even, to be constantly interrupted in all that you have to do, to never, ever get to finish a thought, even thoughts about things that matter in your daily slog. The adult human brain needs a regular and predictable chance to focus completely on adult level material and a chance to decompress from the constant, stressful, and exhausting alertness that is required when dealing with babies and small children.
@mincepiemaker, you absolutely can change your mind.
This is really good advice from Iwonder08
Please talk to your husband. Please don't tell him he gets it easy and that his drive to work is a nice break. Avoid all the competitive comparison. Tell him how you feel overwhelmed. You need to work as a unit, that includes making sure you get some reasonable support and potentially consider getting some sort of job.
You need more teamwork. Helping out with chores is nice as far as it goes, but you need a break from the constant demands and interruptions. You need to regain your headspace (something that will take a while btw - you will feel completely at a loose end if you and H begin sharing the parenting more effectively).
You need a good, solid hour to yourself every day during which you will never be interrupted by your H or your children. You could read, watch something on Netflix, learn to speak French, go out for a walk at a speed greater than that of a toddler, whatever. Or you could just sit there and let your mind wander. That's probably unimaginable right now.
He needs to make sure you have the time in the morning to have a shower and get dressed. He should be able to sit the baby and toddler down and feed them breakfast. Or he needs to take them off your hands in the evenings and do whatever they need so that you can wash then.
He needs to take full responsibility for parenting the children and doing housework at the same time on one weekend day. Or if you find it satisfying to get lots done around the house without interruptions, then he could skip the housework bit.
Planning for a time when you will have time to spare is really important. Right now you have your hands well and truly full, but if you were able to put the DCs in nursery for a couple of days per week you might be able to take a course that might lead to employment opportunities in a few years.