you do not appear that large.
the paint has good bone and is built well. his back is a bit long, but he is stocky. I doubt he would have any problem carrying you.
But, your "dote " on him thing made me want to insert a friendly warning to not fall for the spoiling the new horse routine.
many owners buy a really nice horse, well trained, good manners, and they "love" it into being really spoiled, and wonder where the nice horse they bought went. love it like a smart parents loves children; with vitamin N , when needed. (that's N for "NO)