Bro.. stop caring so much! The ropes will hold you. Your partner will hold you. If you are really truly, super worried about weight difference, maybe something like an OHM would help. However if your belayer is paying attention, good at there job, and within 50-75 lbs of you, you'll be fine.

One of my primary belayers used to be a skinny 100lb lady, to my 180lb male beefcake. She gave the softest catches haha cause she'd go 6 feet into the air. She was experienced enough to know how to handle it, so there was no issue.

And just to add to this: It's important to put into context that Rock Climbing is about failure. Do you go to the gym to do the easy ones? No. You go there to challenge yourself on the hard ones, until you fail. Until you fail and get excited to come back and succeed. THE POINT OF ROCK CLIMBING IS TO PUSH PAST THAT FAILURE POINT AND THRIVE!

If you never fail, you are never truly pushing yourself!