Center Console Boats And More

I need help about fishing boat and weight?

I am going fishing for the first time next week.My friend owns a regular fishing boat nothing flashy,just a boat with a small motor on the back.
I've never been on a boat but my situation is this
I weight about 280 lbs,I don't want to embarrass myself by getting on the boat and sinking it.Will the boat hold me or will it cause one side to sink and the other to lift like a teeter totter? I will not go if this is going to happen..do you think the boat will hold me? my friend is about 170.Thanks.