You're doing fine with the solids - really that's a great foundation as long as he's still getting breastmilk. I breastfed my sons for well over 1 year (2 1/2 for my oldest and 3 1/2 for my younger son). That sounds insane, but as a working mnother that helped keep an extremely strong bond and allowed us to reconnect at the end of the day. I followed what they called infant/child led weaning. They gradually nurse less and less and usually by 15 mos., my boys were nursing only in the morning and before naptime/bedtime. Then over time, we dropped the morning nursing and then the naptime nursing was gone by 18 mos. and we were left with nighttime nursing until 2-2 1/2. That stopped once my sons were more interested in reading at bedtime than nursing and they no longer fell asleep nursing. After that the boys only nursed when they needed comfort, so as time goes by they nursed only once a week and gradually once a month. One thing to keep in mind if you nurse beyond a year is that after one year, generally the baby should get solids BEFORE nursing, whereas up to one year, they should nurse before getting the solids, since for the first year, the breastmilk is the primary source of nutrition.
As a working fulltime mother, I have zero regrets about investing this time in breastfeeding. Extended breastfeeding is one decision I made as a mother that I know for certain was absolutely right for my boys. We later learned that we all have an autoimmune disease (celiac) and a dairy allergy. So, I think both my sons really benefitted from the extra immunity provided by breastfeeding. Also, there is a big bonus for mom - the longer you breastfeed, the lower your chance of developing breast cancer. This may be why western countries have the highest of breast cancer, since extended breastfeeding is very uncommon. Another reason I think this worked so well for me as that the hormone released when the milk letsdown (oxytocin) is an incredible feel good and relaxing hormone. I'm a type A person and nursing really helped me relax.
Also, contrary to some of the popular viewpoints, breastfeeding for an extended time does not make the kids more dependent on mom - it makes them more independent in my experience because they have such a strong connection to mom and breastfeeding meets both their complete physical and emotional needs in the early years - they often feel far more secure. In my experience, these kids are often extremely independent. My sons are now teenagers and I honestly believe that they would be entirely different boys if I had not breastfed so long - that really changed my attitude about mothering - in particular that the most important thing is to invest time early on. I am now seeing the rewards. Also, research shows that breastfeeding increases IQs- both my sons are doing exceptionally well in school - in particular with regards to standardized tests for college. My older son will most likely be able to get a full scholarship to a good 4 year college when he graduates based on his standardized test scores and grades.
Overall, the benefits of breastfeeding continue to add up over time - i.e., even nursing at two years still increase the benefits - the breastmilk content and makeup changes as the frequency of nursing changes.
That all said, it is a personal decision and you have to do what feels right for you and your child - kids innately pickup on how Mom feels about things and if your ambivalent or resentful, your baby will know. If you do want to nurse until the baby weans, there's an excellent book: Mothering your Nursing toddler that deals with practical aspects - for example, letting your child know that they can only nurse at home as they get older. I had this discussion with my youngest when he was about two - he would usually nurse in church and then sleep (I will tell you that we got sooo many complements about how my sons behaved in church, on airplanes, etc. because of my being able to nurse them).