Seminal leakage, erectile dysfunction

For the past year and a half or so I have been having trouble being intimate with women I meet.  I was single and kind of depressed for a while.  I am still a bit depressed, however I have met a great girl.  Over the past year and a half I have dated 4-5 gorgeous women.  For some reason when I kiss/makeout with them my penis becomes partially erect and begins to leak.  I know that this is supposed to be healthy, however this goes on for a long time.  To the point where my boxer shorts are wet, then when we try and have sex I either can't get an erection period or I get a weak one and almost instantly ejaculate.  The leakage doesn't give me any pleasure like an orgasm.  It has ruined a handful of relationships and left me utterly embarassed and feeling less of a man.  I am currently seeing this beautiful women who I really care about but I am afraid now to be intimate with her because i dont want to ruin things.  When I was younger sex was amazing and I never had any of these issues.  I tried to research this problem online and was just bombarded with websites trying to sell me herbal cures.  Any helpful information at all would be greatly appreciated.
Thanks

[Myron_Long]

Well your situation is not normal. You shouldn't be getting leaks with a half-hard penis during foreplay UNLESS you were fully hard for a while and as you started to go soft again some pre-come will arise.

[CentralNyguy]

yeah I am thinking about swinging by planned parenthood and getting tested.  Not sure if this is a mental problem or physical one.  Some of the std symptoms I looked up were vague, thinking it could possibly be syphilis related?  

[Myron_Long]

yea get tested and make sure you're std free and then we can go from there...

keep me posted!

[CentralNyguy]

So I got tested and I am std free.  So now I think it must be some sort of mental block or something.  I have been depressed the past couple years.  I made some lifestyle changes, stopped binge drinking, quit smoking ciggs, and began to workout again.  Not sure if I have some sort of hangup from my last relationship it was pretty dysfunctional.  Just moved to the are so I don't have any old girlfriends I can try out equipment on so in a week or so I am going to try and pick one up

[CentralNyguy]

I think anxiety may have been playing a major part in it or guilt.  I totally blew it with the last chick.  It was like a bad teen movie.  We were messing around we went into my bedroom I went down on her she was loving it then she went down on me and i was totally soft.  Not only was it soft it had shrunk.  It was as small as when I get out of a cold swimming pool.  

[Myron_Long]

I'm glad to hear you're std free. Now lets get to the next possible issue. Masturbation...

How often do you masturbate? How many times a day or week?