Don't worry about your frame, and definitely don't model your goal weight to be tailored at the UFC weight divisions. Reason being is that a lot of amateur and other lower level professional orgs have a lot more weight classes. 15 pounds between each weight division is a ton, so don't get all caught up in that. Train hard, enjoy it, and your excess weight will shed off in the process. Just have fun man, don't over think anything, and just enjoy each day at a time. Good luck!
It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming.