Know what you feel. But there are ways to prevent "boring, must do" flights.
Never fly alone is indeed a first step. PPL flying should be a social activity, and it can really add much to your social life. Up here you have many small flying clubs with their own aircraft, enthousiastic people sharing the fun to fly. You can participate in "rally's" for fun, attend at flyin's (not by car but by plane!). Never participated but my club even has a yearly vacation, where members fly to a destination, stay there for about a week full of flying and fun, visiting the local area from both on the ground and in the air.
Besides all that, take friends along for something special, try to motivate them a little ie: "ever went to this or that city for breakfast?" It's great how fast you can get somewhere with an aircraft. Once you're in the air... some airports are very nice for "PPL touristic adventures", like Texel in the Netherlands.
Stop thinking "I have to fly a C150", but think "I can do this or that and hey... I can use the C150 for that!"