Do i have E.D and Premature Ejaculation?

Ok so im 15 and whenever i... you know do my thing i watch porn and stuff (dont judge me) and those guys last like 30-45 minutes having sex!!!!! And i usually dont last till halfway thru the thing!! Does this mean i have premature ejaculation problem???? My next question is lyk whenever im in public or something or at home doing absolutly nothing sex related and i will pop a stiffy and i will be lyk wth and just sit there awkwardly till it goes away! Do i have both of these? If i do (which i wudent be surprised) Are they connected in anty way lyk if you i have one odds are i have another?? Please help me :(