I have been suffering for quite a while now. I have convinced myself that when the time will come I won't be able to get it up or I will have PE. I am one of those wait till your marriage guy. But that doesnt mean I havent fooled around. Whenever I am with my fiance I get hard while foreplay but there is always this fear that I will loose my erection. When im masturbating it works fine unless I am worried that it wont. Because of this I have strted masturbating often.

I am so confused and worried that I wont be able to get better. How do I convince myself that I am fine? Should I get some tests done? Is this ED? I need help.