Should I quit MMA for weight lifting?

Now I been doing MMA for five year and I'm 17 year old and one belt away from a black belt, but now it's just starting to get dull and I wanna quit besides the point that I what to be a personal trainer in the future. Its just I reached a Plato in mma and I can't seem to pass it! Besides that point ive always been small I'm a "510" and 135 pound and I can bench 180 once. So I'm not weak but I just what to bulk up and doing all this cardio from mma just doesn't cut it I'm burning to much calories to gain weight. Now to the tournament theses I have at mma once a year and i really don't need them I mean it's just a sport were people what to be competitive I don't what to be and cause of my high ranked belt my sensia always some how convices me and I alway come out very uncomfortable and just wanna leave. I just what to do it for fun but thats not an option I guess. I what someone to help me I just grew so much attached to that place. Don't get me wrong the workout there are great. Plus when I talk to my parents there are like doing this gulit thing on there like yea go ahead and quit and forgot everything you've learn for the passed five years. And thats what leaves me in a hole trying to decide.