dude similarly i can ask you why iodine -iodine do not form 7 bonds . for making of bonds availability of electron is not sufficient . different participating orbitals should get room in space for stabilizaion of bonds .
in case of carbon the hybridisation is not possible as the difference in the energies of 2p and 3s is quite high. generally for other atoms its not energetically favourable, either the e-e repulsion is too strong in case of smaller atoms or the bond. if formed, is too weak to sustain it.
further for carbon or any other element u wont find two atoms only isolated
there are lots of them so carbon forms forms single, double or triple bond which are easier to form there is no requirement as carbon atom itself is stable than C(four)C bond..
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