I need some music advice!?

im a 16 year old rapper from the england with no popularity as i havent released anything yet, but im building on different tracks for the future. Now without sounding cocky please beleive me when i say i would be one of the best lyricists in the uk rap/grime scene if i was heard..if you dont beleive me just assume. Now here in the UK i personally feel are rap/grime scene is better than the US as its easier to get out there and known because all the best Artists and promoters come from london as do i, which means it is soo easy to contact people...i could literally contact anyone in a matter of minutes through facebook suck as LOWKEY who is the most popular Uk artists globally. So my problem is i have amazing ideas for Myself and these famous Uk artists to collaborate with me but i dont know how to speak to them about it without them stealing my idea..i mean if your famous and a unknown kid tells you a genius idea you would naturally steal it...well i know it would happen so i need to know how i can convince them for us to collaborate on a track which will ultimentley get my name out there as i would demolish the track(remember to assume i would be the best on the track if u dont beleive me) so please give me some advice guys, i know if my plans came toghether an i got to work with these artists i would blow up...but i just dont know how to get them to listen to my ideas and help me out without stealing them...but yh please help, thanks :)