If you are using reference, and the shapes you make are translations of what you see, that is abstraction. This happens in all types of work to varying degrees. If you are not referencing person, place or thing, then what you are doing might be called non-objective. In this case, the work can be about formal aspects, and sometimes about the process or the materials, or of course, some combination. One might also be interested in formal aspects, process and materials as a realist or abstract painter/maker. But to say you are an abstract painter begs the question: What are you abstracting?